A view of the Russian navy Frigate "Pytlivyy" docked in the port of Sevastopol, where a Ukrainian navy base is located, on March 6, 2014. Ukraine accused Russia of stoking tensions today as the UN Security Council and European leaders held emergency talks, while OSCE monitors were expected in Crimea in a mission to defuse tensions. AFP PHOTO / FILIPPO MONTEFORTE

A Russian military ship sails in Sevastopol bay on March 6, 2014. Ukraine's premier Arseniy Yatsenyuk on Thursday dubbed as "illegitimate" a request by the local parliament in Crimea to become part of Russia. AFP PHOTO/ VIKTOR DRACHEV

A Russian military ship sails in Sevastopol bay on March 6, 2014. Ukraine's premier Arseniy Yatsenyuk on Thursday dubbed as "illegitimate" a request by the local parliament in Crimea to become part of Russia. AFP PHOTO/ VIKTOR DRACHEV

Russian soldiers guard a pier where two Ukrainian naval ships are moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Andrew Lubimov)

Russian soldier guards a Soviet-made anti-aircraft missile launchers at a Ukrainian military unit, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Andrew Lubimov)

Russian soldiers guard a pier where two Ukrainian naval ships are moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Andrew Lubimov)

Russian soldiers guard a pier where two Ukrainian naval ships are moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Andrew Lubimov)

Ukrainian flag flies on the Ukrainian naval vessel Slavutich as Russian soldiers guard a pier where the vessel is moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Ivan Sekretarev)

Russian soldiers guard a peer where two Ukrainian naval vessels are moored, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Ivan Sekretarev)

A Russian soldier guards a Soviet-made anti-aircraft missile launchers at a Ukrainian military unit, in Sevastopol, Ukraine, on Wednesday, March 5, 2014. Ukraine's new prime minister said Wednesday that embattled Crimea must remain part of Ukraine, but may be granted more local powers. Since last weekend, Russian troops have taken control of much of the peninsula in the Black Sea, where Russian speakers are in the majority. (AP Photo/Andrew Lubimov), APTOPIX

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

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

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

Russian forces look out at 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

Russian forces look out at 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

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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

Russian forces look out at 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

A member of the Russian troops stands guard 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

Russian forces look out at 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 / VIKTOR DRACHEV

Russian forces look out at 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 / VIKTOR DRACHEV

Russian forces look out at 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

Russian forces look out at 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 / VIKTOR DRACHEV

A member of the Russian troops stands guard 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

A member of the Russian troops stands guard 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 / VIKTOR DRACHEV

Members of the Russian troops stand guard 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 / VIKTOR DRACHEV

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 / VIKTOR DRACHEV

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 / VIKTOR DRACHEV

Russian navy vessels block the entrance to the harbor of Sevastopol where a Ukrainian naval base is located, 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

Russian navy vessels block the entrance to the harbor of Sevastopol where a Ukrainian naval base is located, 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

The Russian navy minesweeper ship 'Turbinist' patrols the entrance to the harbor of Sevastopol on March 5, 2014. The Ukrainian soldiers hung matresses on the edge of the navy ship's railing to prevent Russian forces from forcefully boarding the ship with grappling hooks. 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

A view of military vessels in the harbor of the Ukrainian city of Sevastopol where a Ukrainian navy base is located, on March 5, 2014. The Ukrainian soldiers hung matresses on the edge of the navy ship's railing to prevent Russian forces from forcefully boarding the ship with grappling hooks. 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

TOPSHOTS 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 / VIKTOR DRACHEV

Russian navy ship mineweeper 'Turbinist' patrols the harbor of Sevastopol on March 5, 2014. The US and Russia stepped up diplomatic efforts to defuse the Ukraine crisis on March 5 amid heightened tensions on the ground in the flashpoint area of Crimea as gunmen threatened the UN envoy. AFP PHOTO/Filippo MONTEFORTE

Russian navy ship mineweeper 'Turbinist' patrols the harbor of Sevastopol on March 5, 2014. The US and Russia stepped up diplomatic efforts to defuse the Ukraine crisis on March 5 amid heightened tensions on the ground in the flashpoint area of Crimea as gunmen threatened the UN envoy. AFP PHOTO/Filippo MONTEFORTE

Russian navy ship mineweeper 'Turbinist' patrols the harbor of Sevastopol on March 5, 2014. The US and Russia stepped up diplomatic efforts to defuse the Ukraine crisis Wednesday amid heightened tensions on the ground in the flashpoint area of Crimea as gunmen threatened the UN envoy. AFP PHOTO/Filippo MONTEFORTE

Russian navy ship mineweeper 'Turbinist' patrols the harbor of Sevastopol on March 5, 2014. The US and Russia stepped up diplomatic efforts to defuse the Ukraine crisis on March 5 amid heightened tensions on the ground in the flashpoint area of Crimea as gunmen threatened the UN envoy. AFP PHOTO/Filippo MONTEFORTE

The Russian Seagoing Armament Transport "General Ryabikov" patrols the harbour of Sevastopol on March 5, 2014. The Russian Black Sea Fleet commander Aleksandr Vitko has issued an ultimatum to the Ukrainian military personnel in Crimea, the Interfax-Ukraine news agency reported. Ukraine accused Russia on March 3 of pouring more troops into Crimea as world leaders grappled with Europe's worst standoff since the Cold War and the Moscow market plunged on fears of an all-out conflic AFP PHOTO/Filippo MONTEFORTE

The Russian Seagoing Armament Transport "General Ryabikov" patrols the harbour of Sevastopol on March 5, 2014. The Russian Black Sea Fleet commander Aleksandr Vitko has issued an ultimatum to the Ukrainian military personnel in Crimea, the Interfax-Ukraine news agency reported. Ukraine accused Russia on March 3 of pouring more troops into Crimea as world leaders grappled with Europe's worst standoff since the Cold War and the Moscow market plunged on fears of an all-out conflic AFP PHOTO/Filippo MONTEFORTE

Russian military vessels patrol the harbour of Sevastopol on March 5, 2014. The Russian Black Sea Fleet commander Aleksandr Vitko has issued an ultimatum to the Ukrainian military personnel in Crimea, the Interfax-Ukraine news agency reported. Ukraine accused Russia on March 3 of pouring more troops into Crimea as world leaders grappled with Europe's worst standoff since the Cold War and the Moscow market plunged on fears of an all-out conflic AFP PHOTO/Filippo MONTEFORTE

Russian military vessels patrol the harbour of Sevastopol on March 5, 2014. The Russian Black Sea Fleet commander Aleksandr Vitko has issued an ultimatum to the Ukrainian military personnel in Crimea, the Interfax-Ukraine news agency reported. Ukraine accused Russia on March 3 of pouring more troops into Crimea as world leaders grappled with Europe's worst standoff since the Cold War and the Moscow market plunged on fears of an all-out conflic AFP PHOTO/Filippo MONTEFORTE