Pro-Russian rebels leave prosecutor's office, TV centre in Ukraine's Luhansk
UKRAINE-CRISIS/LUHANSK (URGENT):Pro-Russian rebels leave prosecutor's office, TV centre in Ukraine's Luhansk
Kremlin says Kiev will be held responsible for "punitive operation"
UKRAINE-CRISIS/KREMLIN-RESPONSIBILITY (URGENT):Kremlin says Kiev will be held responsible for "punitive operation"
A pro-Russian separatist guards a checkpoint as tyres burn behind him near the town of Slaviansk
A pro-Russian separatist guards a checkpoint as tyres burn behind him near the town of Slaviansk in eastern Ukraine May 2, 2014. Ukraine launched a "large-scale operation" to retake the eastern town of Slaviansk, pro-Russian separatists there said on Friday, in an escalation of violence in what has become the worst confrontation between Russia and the West since the Cold War. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A pro-Russian separatist guards a check point near the town of Slaviansk
A pro-Russian separatist guards a checkpoint near the town of Slaviansk in eastern Ukraine May 2, 2014. Ukraine launched a "large-scale operation" to retake the eastern town of Slaviansk, pro-Russian separatists there said on Friday, in an escalation of violence in what has become the worst confrontation between Russia and the West since the Cold War. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Civilians talk with Ukrainian troops at a checkpoint near the town of Slaviansk
Civilians talk with Ukrainian troops at a checkpoint near the town of Slaviansk in eastern Ukraine May 2, 2014. Ukrainian forces attacked the rebel-held city of Slaviansk before dawn on Friday and pro-Russia separatists shot down at least one attack helicopter, killing a pilot, in a sharp escalation of the conflict. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
Pro-Russian rebels seize railway post near Ukraine's Donetsk, halt trains
UKRAINE-CRISIS/TRAINS (URGENT):Pro-Russian rebels seize railway post near Ukraine's Donetsk, halt trains
A pro-Russian activist stands guard at the entrance of seized regional government headquarters in Luhansk
A pro-Russian activist stands guard at the entrance of seized regional government headquarters in Luhansk, eastern Ukraine, May 2, 2014. Ukrainian forces attacked the rebel-held city of Slaviansk before dawn on Friday and pro-Russia separatists shot down at least one attack helicopter, killing a pilot, in a sharp escalation of the conflict. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A pro-Russian separatist shows Ukrainian bullet casings at a pro-Russian checkpoint near the town of Slaviansk
A pro-Russian separatist shows Ukrainian bullet casings at a pro-Russian checkpoint near the town of Slaviansk in eastern Ukraine May 2, 2014. Ukrainian forces attacked the rebel-held city of Slaviansk before dawn on Friday and pro-Russia separatists shot down at least one attack helicopter, killing a pilot, in a sharp escalation of the conflict. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Women stand in front of seized regional government headquarters in Luhansk
Women stand in front of seized regional government headquarters in Luhansk, eastern Ukraine, May 2, 2014. Ukrainian forces attacked the rebel-held city of Slaviansk before dawn on Friday and pro-Russia separatists shot down at least one attack helicopter, killing a pilot, in a sharp escalation of the conflict. REUTERS/Vasily Fedosenko (UKRAINE - Tags: CIVIL UNREST POLITICS)
Woman leaves the seized regional government headquarters as pro-Russian activists guard it in Luhansk
A woman leaves the seized regional government headquarters as pro-Russian activists guard it in Luhansk, eastern Ukraine, May 2, 2014. Ukrainian forces attacked the rebel-held city of Slaviansk before dawn on Friday and pro-Russia separatists shot down at least one attack helicopter, killing a pilot, in a sharp escalation of the conflict. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)