Ukrainian soldiers stand guard at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine
Ukrainian soldiers stand guard 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)
Officials from the OSCE special mission in Ukraine leave the mayor's office in Slaviansk
Officials from the OSCE special mission in Ukraine leave the mayor's office in Slaviansk April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Officials from the OSCE special mission in Ukraine leave the mayor's office in Slaviansk
Officials from the OSCE special mission in Ukraine leave the mayor's office in Slaviansk April 29, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
A Ukrainian soldier stands guard at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine
A Ukrainian soldier stands guard 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)
A Ukrainian soldier stands guard in front of an armoured personnel carriers at a check point near the village of Malinivka, southeast of Slaviansk, in eastern Ukraine
A Ukrainian soldier stands 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)
Pro-Russian activist burns portraits and Ukrainian state symbol outside regional prosecutor's office in Lugansk
A pro-Russian activist burns portraits and Ukrainian state symbols outside regional prosecutor's office in Luhansk, eastern Ukraine, April 29, 2014. Pro-Russian separatists opened fire on a police station in the city of Luhansk on Tuesday after seizing the regional government headquarters, as Kiev's control over swathes of eastern Ukraine evaporates. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
"Good progress" made on release of OSCE observers -Ukraine separatists
UKRAINE-CRISIS/OSCE-DETAINED (URGENT):"Good progress" made on release of OSCE observers -Ukraine separatists
Pro-Russian activist talks to a Ukrainian Interior Ministry security forces member outside the regional government headquarters in Luhansk
REFILE - CLARIFYING CAPTION A pro-Russian activist talks to a Ukrainian Interior Ministry security forces member outside the regional government headquarters in Luhansk, eastern Ukraine, April 29, 2014. Hundreds of pro-Russian separatists seized the regional government headquarters in Luhansk on Tuesday, unopposed by police, underlining the lack of control of central government over swathes of eastern Ukraine. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists and Ukrainian Interior Ministry security forces gather outside the regional government headquarters in Luhansk
REFILE - CLARIFYING CAPTION Pro-Russian activists and Ukrainian Interior Ministry security forces (back) 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)
Pro-Russian activists gather near Ukrainian Interior Ministry security forces who stand in formation outside the regional government headquarters in Luhansk
REFILE - CLARIFYING CAPTION Pro-Russian activists gather near Ukrainian Interior Ministry security forces who stand in formation outside the regional government headquarters in Luhansk, eastern Ukraine, April 29, 2014. Hundreds of pro-Russian separatists seized the regional government headquarters in Luhansk on Tuesday, unopposed by police, underlining the lack of control of central government over swathes of eastern Ukraine. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)