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Fri, 2 May 2014 09:10 AM

Pro-Russian activists stand 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)

Fri, 2 May 2014 09:05 AM

Pro-Russian activists stand 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)

Fri, 2 May 2014 09:04 AM

Pro-Russian activists stand 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)

Fri, 2 May 2014 09:02 AM

A boy with a toy gun walks 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: POLITICS CIVIL UNREST)

Fri, 2 May 2014 08:55 AM

Ukrainian soldiers stand guard at a Ukrainian checkpoint near the eastern town of Slaviansk 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)

Fri, 2 May 2014 08:53 AM

Ukrainian soldiers sit on a armoured personnel carrier at a Ukrainian checkpoint near the eastern town of Slaviansk 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)

Fri, 2 May 2014 08:54 AM

Ukrainian soldiers sit on an armoured personnel carrier at a Ukrainian checkpoint near the eastern town of Slaviansk 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)

Fri, 2 May 2014 08:52 AM

Ukrainian soldiers sit on a armoured personnel carrier at a Ukrainian checkpoint near the eastern town of Slaviansk 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)

Fri, 2 May 2014 08:50 AM

Ukrainian soldiers stand guard at a Ukrainian checkpoint near the eastern town of Slaviansk 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)