Unarmed Ukrainian soldiers (L) stand at the entrance to their base blocked by Russian troops in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian soldiers (R) stand guard inside their base blocked by Russian troops in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian soldiers (R) stand guard inside their base blocked by Russian troops in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian soldiers (R) stand guard inside their base blocked by Russian troops in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian troops block a Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A Ukrainian officer (L) stands behind Russian troops blocking a Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A Ukrainian officer (C) stands behind Russian troops blocking a Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A member of the Russian forces stands guard by a Ukrainian Navy emblem painted on a wall outside the Ukrainian base in Perevalnoye, near Simferopol, blocked by Russian troops on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A member of the Russian forces stands guard by a Ukrainian Navy emblem painted on a wall outside the Ukrainian base in Perevalnoye, near Simferopol, blocked by Russian troops on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces block the Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces block the Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A Ukrainian officer walks past Russian forces blocking the Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A member of the Russian forces stands guard in front of a blocked Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A Ukrainian officer looks out from the base as Russian forces block it, in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

A Ukrainian officer looks out from the base as a member of the Russian forces stands guard outside in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian officers' wives gather outside the military base blocked by Russian forces in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Pro-Russian self-defence activists warm themselves at a fire in a steel drum as Russian forces block the Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces block the entrance to the Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces block the entrance to the Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces block the Ukrainian military base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Russian forces gather by their light armoured vehicle (LAV) as they block the Ukrainian base in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Pro-Russian volunteers stand guard in front of Crimea's parliament building during a pro-Russian rally in Simferopol on March 6, 2014. AFP PHOTO / ALEXANDER NEMENOV

A woman takes money from an ATM as Russian forces stand by in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian army sergeant walks outside the Ukrainian military base blocked by Russian forces in Perevalnoye, near Simferopol, on March 6, 2014. Pro-Moscow authorities in Crimea on March 6 asked Russian President Vladimir Putin to examine a request for their region to join the Russian Federation, which will be put to a referendum on March 16. AFP PHOTO/ GENYA SAVILOV

Ukrainian soldiers guard the military base at the Black Sea port of Sevastopol in Crimea, Ukraine, Wednesday, March 5, 2014. A special U.N. envoy visiting Crimea was threatened by 10 to 15 armed men on Wednesday and ordered to leave the region, where Ukraine and Russia are locked in a tense standoff. (AP Photo/Darko Vojinovic)

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

A local resident talks on the phone next to Russian forces blocking access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces block access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

A boy passes in front of Russian forces blocking access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

A girl passes in front of Ukrainian soldiers guarding the entrance to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

A boy passes by Russian forces blocking access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, as Ukrainian soldiers stand guard behind the entrance gate, not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Local residents walk by Russian forces (R) blocking access to the base of the 36th detached brigade of the Ukrainian Navy's coastal guards, as Ukrainian soldiers stand guard behind the entrance gate (L), not far from the village of Perevalne, near Simferopol, on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / ALEXANDER NEMENOV

Russian forces patrol near the Ukrainian navy ship Slavutich in the harbor of the Ukrainian city of Sevastopol on March 5, 2014. Russian forces seized partial control of two Ukrainian missile bases in Crimea today as Western and Russian leaders stepped up efforts to defuse the region's worst crisis since the Cold War. AFP PHOTO / FILIPPO MONTEFORTE

Pro Russian soldiers guarding Ukraine's infantry base in Perevalne, Ukraine, Tuesday, March 4, 2014. Tensions remained high in the strategic Ukrainian peninsula of Crimea with troops loyal to Moscow firing warning shots to ward off protesting Ukrainian soldiers. (AP Photo/Sergei Grits)

Pro Russian soldiers guard Ukraine's infantry base in Perevalne, Ukraine, Tuesday, March 4, 2014. Russian President Vladimir Putin said Moscow reserves the right to use all means to protect Russians in Ukraine as U.S. Secretary of State John Kerry was on his way to Kiev. Tensions remained high in the strategic Ukrainian peninsula of Crimea with troops loyal to Moscow firing warning shots to ward off protesting Ukrainian soldiers. (AP Photo/Sergei Grits)

Pro Russian soldiers guarding Ukraine's infantry base in Perevalne, Ukraine, patrol the area Tuesday, March 4, 2014. Russian President Vladimir Putin said Moscow reserves the right to use all means to protect Russians in Ukraine as U.S. Secretary of State John Kerry was on his way to Kiev. Tensions remained high in the strategic Ukrainian peninsula of Crimea with troops loyal to Moscow firing warning shots to ward off protesting Ukrainian soldiers. (AP Photo/Sergei Grits)

Unidentified gunmen guard the gate of an infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

A woman passes by unidentified gunmen, as they guard Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Unidentified gunmen guard the gate of an infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Ukrainian soldiers, left and unidentified gunmen, right, guard the gate of an infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Unidentified gunmen guard Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Unidentified armed men prepare their camp in front of Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

An unidentified armed man guards the gate of Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Unidentified armed men prepare their camp in front of Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Unidentified gunmen guard Ukraine's infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

An unidentified armed man stands guard outside a Ukraine infantry base in Privolnoye, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified gunmen arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

A Russian solder waits outside of a Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded a Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

Ukrainian armored personnel carrier leaves its position behind the gate, at the military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded a Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

Russian soldiers walk as a local resident waves with Russian flag outside of Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

Russian soldiers sits atop an armored vehicle outside of Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

A local resident gestures as he poses for a photograph with Russian soldiers outside of Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

Russian soldiers walk toward their trucks outside of Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

Unidentified armed men guard Ukraine's infantry base in Perevalne, Ukraine, Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded a Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. The outnumbered Ukrainians placed a tank at the base's gate, leaving the two sides in a tense standoff. (AP Photo/Darko Vojinovic)

An unidentified armed man patrols around their camp in front of Ukraine's infantry base in Perevalne, Ukraine, Sunday, March 2, 2014. Hundreds of unidentified armed men arrived outside Ukraine's infantry base in Privolnoye in its Crimea region. The convoy includes at least 13 troop vehicles each containing 30 soldiers and four armored vehicles with mounted machine guns. The vehicles ? which have Russian license plates ? have surrounded the base and are blocking Ukrainian soldiers from entering or leaving it. (AP Photo/Darko Vojinovic)

Pedestrians pass by unidentified gunmen guarding Ukraine's infantry base in Perevalne, Ukraine, Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded a Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. The outnumbered Ukrainians placed a tank at the base's gate, leaving the two sides in a tense standoff. (AP Photo/Darko Vojinovic)

Unidentified armed men patrol around a Ukraine infantry base in Perevalne, Ukraine, Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. The outnumbered Ukrainians placed a tank at the base's gate, leaving the two sides in a tense standoff. (AP Photo/Darko Vojinovic)

Unidentified armed men patrol around a Ukraine's infantry base in Perevalne, Ukraine, Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. The outnumbered Ukrainians placed a tank at the base's gate, leaving the two sides in a tense standoff. (AP Photo/Darko Vojinovic)

Russian solders walk as a local resident waves with Russian flag outside of a Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev), APTOPIX

Armed men in military fatigues block a Ukrainian military unit not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

A man holds a Russian flag as armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

A man holds a Russian flag as armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

Armed men in military fatigues stand near a painted Ukrainian coat of arms symbol as they block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

An Orthodox priest holds a crucifix next to one of many armed men in military fatigues blocking access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

An Orthodox priest holds a crucifix next to armed men in military fatigues blocking access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

An elderly man holds a Russian flag as unidentified armed men in uniform block a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

ALTERNATIVE CROP A Russian flag flies in the foreground as unidentified armed men in uniform block a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

A Russian flag flies in the foreground as unidentified armed men in uniform block a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

Unidentified armed men in uniform block a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

Two civilians stand by as unidentified armed men in uniform block a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

A man waves a Russian flag as people gather in front of a Ukrainian military base near the village of Perevalne, 20 km south of Simferopol, as unidentified armed men in uniform block the base on March 2, 2014. A group of 1,000 armed men were blocking the entrance to a unit of Ukraine's border guards in a tense standoff in the south of the flashpoint Crimea peninsula on March 2, the defence ministry said. "One thousand armed fighters and around 20 trucks are blocking the perimetre of the 36th brigade of border guards... in Perevalne," the ministry said in a statement, as tensions remain high after Russia's parliament approved the deployment of troops in Ukraine. It did not indicate what nationality the armed men were. AFP PHOTO/ GENYA SAVILOV

TOPSHOTS Armed men in military fatigues block access to a Ukrainian border guards base not far from the village of Perevalne near Simferopol on March 2, 2014. About 1,000 armed men surrounded the base of the 36th detached brigade of the Ukrainian Navy's coastal guards today in a tense standoff in the flashpoint Crimea peninsula. Ukraine's new leaders announced a full mobilisation of the army today, a day after Moscow officially approved the deployment of its troops to its western neighbour. AFP PHOTO / GENYA SAVILOV

SIMFEROPOL, UKRAINE - MARCH 2: Members of the Russian armed forces stand guard around the Ukrainian military base in the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. Russia???s armed forces have surrounded Ukraine's troops in the Perevalnoye neighborhood in Ukraine's Autonomous Republic of Crimea, on Sunday. Ukraine???s military units in Perevalnoye, some 20 km far from Crimea???s capital Simferopol, were encircled by more than 200 Russian soldiers. Russia currently has 25 armored vehicles in the region. Bulent Doruk / Anadolu Agency

SIMFEROPOL, UKRAINE - MARCH 2: Members of the Russian armed forces stand guard around the Ukrainian military base in the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. Russia???s armed forces have surrounded Ukraine's troops in the Perevalnoye neighborhood in Ukraine's Autonomous Republic of Crimea, on Sunday. Ukraine???s military units in Perevalnoye, some 20 km far from Crimea???s capital Simferopol, were encircled by more than 200 Russian soldiers. Russia currently has 25 armored vehicles in the region. Bulent Doruk / Anadolu Agency

SIMFEROPOL, UKRAINE - MARCH 2: Members of the Russian armed forces stand guard around the Ukrainian military base in the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. Russia???s armed forces have surrounded Ukraine's troops in the Perevalnoye neighborhood in Ukraine's Autonomous Republic of Crimea, on Sunday. Ukraine???s military units in Perevalnoye, some 20 km far from Crimea???s capital Simferopol, were encircled by more than 200 Russian soldiers. Russia currently has 25 armored vehicles in the region. Bulent Doruk / Anadolu Agency

SIMFEROPOL, UKRAINE - MARCH 2: Members of the Russian armed forces stand guard around the Ukrainian military base in the village of Perevalne, 20 km south of Simferopol, on March 2, 2014. Russia???s armed forces have surrounded Ukraine's troops in the Perevalnoye neighborhood in Ukraine's Autonomous Republic of Crimea, on Sunday. Ukraine???s military units in Perevalnoye, some 20 km far from Crimea???s capital Simferopol, were encircled by more than 200 Russian soldiers. Russia currently has 25 armored vehicles in the region. Bulent Doruk / Anadolu Agency