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Russian President Vladimir Putin, left, speaks with Ukrainian President Viktor Yanukovych during a religious service in Kiev, Ukraine, Saturday, July 27, 2013. The Liturgy took place near the Monument to Prince Vladimir overlooking the Dnepr River. Ukraine is celebrating marking the 1025th anniversary of Russia and Ukraine's conversion to Christianity. (AP Photo/Sergei Chuzavkov)
A pressure-gauge and a valve set on a gas pipe of gas-compressor station in the small Ukrainian city of Boyarka, near Kiev on January 2, 2009. Russia cut off gas supplies to Ukraine on January 1, 2009 and sharply raised rates after failure to agree on a new contract, heightening concerns over European dependence on Russian-controlled energy supplies. A Ukrainian delegation will begin touring European capitals today to discuss gas delivery problems after Russia cut off supplies to neighbouring Kiev, the foreign ministry was quoted as saying. AFP PHOTO/ SERGEI SUPINSKY
PHOTO: EAST NEWS/AFP Soldiers sit on a top a WWII T-34 tank and hold the Victory Banner, which the Soviet Army hoisted above the Reichstag in 1945, during a military parade in the Ukrainian capital Kiev 28 October 2004. Russian President Vladimir Putin, along with other leaders of ex-Soviet states, arrived in Kiev to attend festivities marking the 60th anniversary of the liberation of Ukraine from the Nazi occupation during World War II, three days before Ukraine's presidential elections 31 October
Supporters of Ukrainian Prime Minister Viktor Yanukovych, the official winner of Ukraine's presidential election, wave a Russian flag during a mass rally on central square in Donetsk, an industrial city in eastern Ukraine, Monday, Nov. 29, 2004. The legislature in Ukraine's eastern Donetsk region voted Sunday to hold a referendum on autonomy for the province, raising the stakes in a struggle for control over a country divided by a bitterly disputed presidential election. (AP Photo/Sergei Grits)
Ukraine's President Viktor Yanukovych, left, and Poland's Prime Minister Donald Tusk speak during a news conference following talks on steps being taken to bring Ukraine closer to the European Union in Warsaw, Poland, on Thursday, Sept. 29, 2011. Poland has emerged as a key European advocate of deeper EU integration with the region, eager to see its post-communist neighbors evolve into stable, prosperous democracies. (AP Photo/Czarek Sokolowski)
Ukrainian President Viktor Yanukovych (L) and his Polish counterpart Bronislaw Komorowski (R) share a toast during an official dinner at the Presidential Palace in Warsaw, on February 3, 2011. Joining the EU remains Ukraine's top priority, Yanukovych said today during a visit to Poland, which takes the helm of the 27-nation bloc later this year. AFP PHOTO/POOL/ALIK KEPLICZ
Local residents dance with a European Union flag during a celebration to mark a day of Europe in eastern Ukrainian city of Donetsk, late Sunday, May 22, 2005. After President Viktor Yushchenko's first three months in office he acknowledged that the impoverished nation of 48 million, which seeks membership in NATO and the European Union, must do considerable work to become an EU member. (AP Photo/Vladimir Sindeyev)
Supporters of Ukrainian pro-government Party of the Regions wave flags during their rally in central Kiev on October 26, 2012. Ukraine's opposition and the party of President Viktor Yanukovych on Friday made a final push for votes on the last day of campaigning before the country's tightly-contested weekend parliamentary polls. AFP PHOTO / VIKTOR DRACHEV
TOPSHOTS A protester holds a Ukrainian flag during a rally at the Independence square in Kiev on July 18, 2013. Protesters on July 18 held a rally and set up tents on Kiev central square to protest against police brutality and abuse as villagers from Vradievka arrived in Kiev after a 380 km pedestrian march. AFP PHOTO / GENYA SAVILOV
Activists of the Ukrainian public organization Alma Mater shout slogans as they hold 66 chickens carcasses during a protets in the center of the western Ukrainian city of Lviv on October 17, 2013. The carcasses symbolize the 66 deputies of Lviv's Regional Council who approved the agreement between Ukraine and US company Chevron for the extraction of shale gas extraction in the Olesky area, in the Lviv region. US energy giant Chevron won a tender last year to explore for shale gas in western Ukraine. The Kiev government sees shale gas development as important for easing its dependence on costly gas imports from Russia which weigh heavily on its economy. But deputies had expressed concerns over the ecological consequences of shale exploration in the mountainous forest region which is known for tourist resorts. AFP PHOTO/ YURIY DYACHYSHYN
Protesters wave a flag with a protrait of jailed former Ukraine Prime minister and opposition leader Yulia Tymoshenko above riot policemen who secure the entrance to the building of Kiev's city council in Kiev on October 23, 2013. Several hundred of people rallied at the Kiev city administration trying to break the city council session and demand to hold council elections. The credentials of the city's deputies ended on July 2, 2013, and the opposition insists that their session is illegal. AFP PHOTO / GENYA SAVILOV
Ukrainian opposition leader Vitali Klitschko addresses a parliament session in Kiev on October 24, 2013. The 42-year-old Ukrainian world boxing champion told a session of parliament he would challenge President Viktor Yanukovych in elections due in March 2015. AFP PHOTO/GENYA SAVILOV