Ukrainian security personnel man a checkpoint near the town of Slaviansk
Ukrainian security personnel man a checkpoint near the town of Slaviansk in eastern Ukraine May 4, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A Ukrainian soldier raises a Ukrainian flag on top of an armoured personnel carrier at a checkpoint near the town of Slaviansk
A Ukrainian soldier raises a Ukrainian flag on top of an armoured personnel carrier at a checkpoint near the town of Slaviansk in eastern Ukraine May 4, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Ukrainian security personnel ride on top of an armoured personnel carrier at a checkpoint near the town of Slaviansk
Ukrainian security personnel ride on top of an armoured personnel carrier at a checkpoint near the town of Slaviansk in eastern Ukraine May 4, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Ukrainian security personnel man a checkpoint near the town of Slaviansk in eastern Ukraine
Ukrainian security personnel man a checkpoint near the town of Slaviansk in eastern Ukraine May 4, 2014. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Pro-Russia protesters storm the governor's business premises in Donetsk, eastern Ukraine
Pro-Russia protesters storm the governor's business premises in Donetsk, eastern Ukraine May 3, 2014. A couple of hundred pro-Russian protesters in the eastern city of Donetsk stormed the governor's business premises and the state security headquarters, ransacking files and smashing windows. The attack reflected growing disorder in the area, targeting as it did a security building that was already largely under rebel control. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
OSCE observers Schneider from Germany and Christensen from Denmark leave a German Air Force aircraft upon their arrival in Berlin's Tegel airport
OSCE observers Axel Schneider (L) from Germany and John Christensen from Denmark leave a German Air Force aircraft upon their arrival in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST MILITARY)
A pro-Russia protester waves a Donbass flag as they storm the governor's business premises in Donetsk
A pro-Russia protester waves a Donbass flag as they storm the governor's business premises in Donetsk, eastern Ukraine May 3, 2014. A couple of hundred pro-Russian protesters in the eastern city of Donetsk stormed the governor's business premises and the state security headquarters, ransacking files and smashing windows. The attack reflected growing disorder in the area, targeting as it did a security building that was already largely under rebel control. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
German Defence Minister von der Leyen gives a a statement to the media with OSCE observers in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen (3nd R) gives a statement to the media with her Czech counterpart Martin Stropnicky (2nd R), her Danish counterpart Nicolai Wammen (5th L), OSCE observers John Christensen (4th L) from Denmark and Germany's Axel Schneider (4th R) in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)
A Ukrainian soldier, with armoured personnel carriers behind him, points his weapon at an approaching car at a checkpoint near the town of Slaviansk in eastern Ukraine
A Ukrainian soldier, with armoured personnel carriers behind him, points his weapon at an approaching car at a checkpoint near the town of Slaviansk in eastern Ukraine May 3, 2014. Russia's Foreign Minister Sergei Lavrov has told his U.S. counterpart John Kerry that the U.S. should use its influence to make Ukraine's government immediately stop military operations in south-east Ukraine, the Russian foreign ministry said in a statement on Saturday. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
German Defence Minister Leyen welcomes OSCE observers Christensen from Denmark and Germany's Schneider in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen (L) welcomes OSCE observers John Christensen (3nd L) from Denmark and Germany's Axel Schneider (2nd L) in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)