Pro-Russian activists and supporters gather at the regional government headquarters in Luhansk
Pro-Russian activists and supporters gather at the regional government headquarters in Luhansk, eastern Ukraine, April 29, 2014. Hundreds of pro-Russian separatists stormed the regional government headquarters in Ukraine's eastern city of Luhansk on Tuesday, gaining access by breaking windows and facing no resistance from police. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Ukrainian Interior Ministry members, blocked by pro-Russian activists, gather outside the regional government headquarters in Luhansk
Ukrainian Interior Ministry members, blocked by pro-Russian activists, gather outside the regional government headquarters in Luhansk, eastern Ukraine, April 29, 2014. Hundreds of pro-Russian separatists stormed the regional government headquarters in Ukraine's eastern city of Luhansk on Tuesday, gaining access by breaking windows and facing no resistance from police. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A Ukrainian soldier stands on an armoured personnel carrier at a check point near the village of Malinivka
A Ukrainian soldier stands on an armoured personnel carrier at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A pro-Russian armed man walks near the seized city council building in Kostyantynivka
A pro-Russian armed man walks near the seized city council building in Kostyantynivka April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A Ukrainian soldier stands guard on a road at a check point near the village of Malinivka
A Ukrainian soldier stands guard on a road at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Pro-Russian armed men are pictured through sand bags as they stand guard in front of seized city council building in Kostyantynivka
Pro-Russian armed men are pictured through sand bags as they stand guard in front of seized city council building in Kostyantynivka April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian armed man stands guard in front of the seized city council building in Kostyantynivka
A pro-Russian armed man stands guard in front of the seized city council building in Kostyantynivka April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka
Ukrainian soldiers stand guard in front of armoured personnel carriers at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)