A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Efrem Lukatsky)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Efrem Lukatsky)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Efrem Lukatsky)

Protesters throw tires onto a fire during clashes with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky)

A protester throws rocks at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. AP Photo/Efrem Lukatsky)

Protesters throw tires onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky), APTOPIX

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic), APTOPIX

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed the downtown Ukrainian capital as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise. (AP Photo/Darko Vojinovic)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits), APTOPIX

A protester walks pass burning tyres in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Protesters use a large slingshot to hurl a Molotov cocktail at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A protester using traffic sign as a shield attends clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A protester gestures with the arms of a broken mannequin, during clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A protester throws tyres onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A protester holds a mannequin head, during clashes in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Darko Vojinovic)

A protester throws stone during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Darko Vojinovic)

A protester breaks up a mannequin on the roof of the burned truck during clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A broken mannequin lies on the roof of burned truck during clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Protesters aim fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A Kiev resident looks at burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky)

Protesters carry tyres onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky)

Priests of different faiths pray during clashes with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits), APTOPIX

A protester throws tires onto a fire during a clash with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits), APTOPIX

A protester beats a dumpster after clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Protesters shield, during clashes with police, in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Priests of different faiths pray during clashes with police in central Kiev, Ukraine, Thursday, Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov), APTOPIX

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov)

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov)

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov)

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov)

A Kiev resident looks at burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Protesters in Ukraine's capital extinguished burning barricades shielding them from the police on Thursday, enforcing a tenuous peace as an ultimatum issued by the opposition to the president was set to expire with no sign of compromise. Opposition leader Vitali Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum expires Thursday evening. (AP Photo/Sergei Chuzavkov)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence, expires Thursday evening. (AP Photo/Sergei Chuzavkov)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence, expires Thursday evening. (AP Photo/Sergei Chuzavkov)

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014 as an ultimatum issued by the opposition to the president was set to expire with no sign of a compromise on Thursday. They demanded that President Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence. (AP Photo/Sergei Chuzavkov)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence, expires Thursday evening. (AP Photo/Sergei Chuzavkov)

Protesters clash with police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev, as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Chuzavkov)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence, expires Thursday evening. (AP Photo/Sergei Chuzavkov)

AP10ThingsToSee - Protesters use a large slingshot to hurl a Molotov cocktail at police in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call for an early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Sergei Grits)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko, center, addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence. (AP Photo/Sergei Chuzavkov)

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko, center, addresses protesters near the burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Klitschko dove behind the wall of black smoke engulfing much of downtown Kiev on Thursday, pleading with both police and protesters to uphold the peace until the ultimatum, demanding that Yanukovych dismiss the government, call early elections and scrap harsh anti-protest legislation that triggered the violence, expires Thursday evening. (AP Photo/Sergei Chuzavkov)

A Ukrainian demonstrator walks past burning tyres and trash set on fire during clashes between pro-EU opposition supporters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

A Ukrainian demonstrator stands amid burning tyres during clashes between pro-EU opposition supporters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

Ukrainian demonstrators take cover during clashes between pro-EU opposition supporters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

Ukrainian demonstrators take cover during clashes between pro-EU opposition supporters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

A Ukrainian demonstrator prepare to throw a stone towards riot police as fellow protesters take cover during clashes between pro-EU opposition supporters and security forces in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

Ukrainian opposition leader and world boxing champion Vitali Klitschko talks with activists in central Kiev on January 23, 2014. Ukraine's opposition agreed Thursday to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO / VASILY MAXIMOV

Head of the Ukrainian opposition UDAR (Punch) party Vitalii Klitshko (C) speaks to protesters at a barricade in the center of the city in Kiev on January 23, 2014. Ukraine's opposition agreed Thursday to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/ VITALIY NOSACH

Head of the Ukrainian opposition UDAR (Punch) party Vitalii Klitshko waves at protesters at a barricade in the center of the city in Kiev on January 23, 2014. Ukraine's opposition agreed Thursday to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/ VITALIY NOSACH

Head of the Ukrainian opposition UDAR (Punch) party Vitalii Klitshko (Top L) speaks to protesters at a barricade in the center of the city in Kiev on January 23, 2014. Ukraine's opposition agreed Thursday to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/ VITALIY NOSACH

A protester wearing a gas mask stands amid burnt tyres and garbage following clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian riot policemen stand guard in central Kiev following clashes with pro-EU protesters on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ice mixed with ash covers a statue in central Kiev as Ukrainian riot policemen (rear) stand guard nearby following clashes with pro-EU protesters on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian protesters walk past a statue of legendary Ukrainian football coach Valeriy Lobanovsky covered in ice mixed with ash following clashes between riot police and pro-EU protesters in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian protesters walk past a statue of legendary Ukrainian football coach Valeriy Lobanovsky covered in ice mixed with ash following clashes between riot police and pro-EU protesters in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian protesters wearing gas masks and military-style clothes walk past burnt vehicles covered in ice mixed with ash following clashes between riot police and pro-EU protesters in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian protesters stand next to firefighters extinguishing a fire that erupted during clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian firefighters extinguish a fire that erupted during clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

A Ukrainian man stands next to a burning pile of tyres set on fire during clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Protesters walk past the statue of legendary Ukrainian football coach Valeriy Lobanovskiy covered in ice mixed with ash outside Dynamo Kiev stadium following clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

A Ukrainian protester walks amid a burning pile of tyres set on fire during clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian women collect stones from the site of clashes between pro-EU protesters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

Ukrainian protesters holding makeshift shields and batons walk past a barricade on Krestschatik Street in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian protesters stand next to a burning pile of tyres set on fire during clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

A Ukrainian protester wearing a helmet and holding a makeshift shield stands next to a pile of burning tyres in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

A protester standing in front of the wreckage of burnt cars shows a rubber bullet used by security forces during clashes in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian riot policemen take position in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

A Ukrainian protester wearing a gas mask stands amid burnt tyres and garbage following clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian riot policemen take position in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Ukrainian riot policemen take position at the site of earlier clashes with pro-EU protesters in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Residents collect stones from the site of clashes between pro-EU protesters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Residents collect stones from the site of clashes between pro-EU protesters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

Residents collect stones from the site of clashes between pro-EU protesters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/GENYA SAVILOV

TOPSHOTS Ukrainian demonstrators take cover during clashes between pro-EU opposition supporters and riot police in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

Former Ukrainian Interior minister Yuriy Lutsenko (C), an opposition figurehead who was jailed under President Viktor Yanukovych, speaks to protesters in front of burned buses and barricades in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO / GENYA SAVILOV

TOPSHOTS A Ukrainian demonstrator prepare to throw a stone towards riot police as fellow protesters take cover during clashes between pro-EU opposition supporters and security forces in central Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. AFP PHOTO / VASILY MAXIMOV

TOPSHOTS Head of the Ukrainian opposition UDAR (Punch) party Vitalii Klitshko (C) speaks to protesters at a barricade in the center of the city in Kiev on January 23, 2014. Ukraine's opposition agreed Thursday to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/ VITALIY NOSACH

TOPSHOTS A protester wearing a gas mask stands amid burnt tyres and garbage following clashes between pro-EU demonstrators and riot police in Kiev on January 23, 2014. Ukraine's opposition agreed to observe an eight-hour truce in clashes with security forces after five days of deadly fighting but threatened to go on the attack if the government failed to agree concessions. Opposition leader and world boxing champion Vitali Klitschko brokered the truce after talks with radical protesters and armoured security forces on the frontline of the clashes, saying the ceasefire should hold while he conducts talks with President Viktor Yanukovych. AFP PHOTO/VOLODYMYR SHUVAYEV

(140123) -- MOSCOW, Jan. 23, 2014 (Xinhua) -- Protestors clash with police in Kiev, Ukraine, Jan. 22, 2014. At least two demonstrators were reported to have been killed in Kiev on Wednesday morning during clashes with officers, the country s General Prosecutor Office said. (Xinhua/RIA) (zw) UKRAINE-KIEV-CLASH PUBLICATIONxNOTxINxCHN Moscow Jan 23 2014 XINHUA protestors Clash With Police in Kiev Ukraine Jan 22 2014 AT least Two demonstrator Were reported to have been KILLED in Kiev ON Wednesday Morning during clashes With Officers The Country S General Prosecutor Office Said XINHUA Estuary ZW Ukraine Kiev Clash PUBLICATIONxNOTxINxCHN

(140123) -- MOSCOW, Jan. 23, 2014 (Xinhua) -- A protestor throws bricks towards police during a clash in Kiev, Ukraine, Jan. 22, 2014. At least two demonstrators were reported to have been killed in Kiev on Wednesday morning during clashes with officers, the country s General Prosecutor Office said. (Xinhua/RIA) (zw) UKRAINE-KIEV-CLASH PUBLICATIONxNOTxINxCHN Moscow Jan 23 2014 XINHUA a protestor throws bricks Towards Police during a Clash in Kiev Ukraine Jan 22 2014 AT least Two demonstrator Were reported to have been KILLED in Kiev ON Wednesday Morning during clashes With Officers The Country S General Prosecutor Office Said XINHUA Estuary ZW Ukraine Kiev Clash PUBLICATIONxNOTxINxCHN

(140123) -- MOSCOW, Jan. 23, 2014 (Xinhua) -- Protestors clash with police in Kiev, Ukraine, Jan. 22, 2014. At least two demonstrators were reported to have been killed in Kiev on Wednesday morning during clashes with officers, the country s General Prosecutor Office said. (Xinhua/RIA) (zw) UKRAINE-KIEV-CLASH PUBLICATIONxNOTxINxCHN Moscow Jan 23 2014 XINHUA protestors Clash With Police in Kiev Ukraine Jan 22 2014 AT least Two demonstrator Were reported to have been KILLED in Kiev ON Wednesday Morning during clashes With Officers The Country S General Prosecutor Office Said XINHUA Estuary ZW Ukraine Kiev Clash PUBLICATIONxNOTxINxCHN

(140123) -- MOSCOW, Jan. 23, 2014 (Xinhua) -- A protestor throws fire bottle towards police during a clash in Kiev, Ukraine, Jan. 22, 2014. At least two demonstrators were reported to have been killed in Kiev on Wednesday morning during clashes with officers, the country s General Prosecutor Office said. (Xinhua/RIA) (zw) UKRAINE-KIEV-CLASH PUBLICATIONxNOTxINxCHN Moscow Jan 23 2014 XINHUA a protestor throws Fire Bottle Towards Police during a Clash in Kiev Ukraine Jan 22 2014 AT least Two demonstrator Were reported to have been KILLED in Kiev ON Wednesday Morning during clashes With Officers The Country S General Prosecutor Office Said XINHUA Estuary ZW Ukraine Kiev Clash PUBLICATIONxNOTxINxCHN

A barricade is seen at the edge of Independence Square, known in Kiev as the Maidan, in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

A barricade is seen at the edge of Independence Square, known in Kiev as the Maidan, in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Protestors and riot police confront each other in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Protestors and riot police confront each other in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Protestors and riot police confront each other in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Protestors and riot police confront each other in the Ukrainian capital Kiev on January 23, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

A protester stands at a burning barricades between police and protesters in central Kiev, Ukraine, Thursday Jan. 23, 2014. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early election or face street rage was set to expire with no sign of a compromise on Thursday. (AP Photo/Efrem Lukatsky)