Masked pro-Russian protesters pose for a picture inside a regional government building in Donetsk
Masked pro-Russian protesters pose for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester sits on a chair as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester sits on a chair as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester sits on a chair as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A pro-Russian protester laughs while posing for a picture inside a regional government building in Donetsk
A pro-Russian protester laughs while posing for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester sits on a chair as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester smokes as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
Pro-Russian armed men standb at the entrance to the regional government headquarters in Luhansk
Pro-Russian armed men stand at the entrance to the regional government headquarters in Luhansk, eastern Ukraine, April 30, 2014. Hundreds of pro-Moscow separatists stormed government buildings in one of Ukraine's provincial capitals on Tuesday and opened fire on police holed up in a regional headquarters, a major escalation of their revolt despite new Western sanctions on Russia. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
A masked pro-Russian protester poses with a pair of binoculars inside a regional government building in Donetsk
A masked pro-Russian protester poses with a pair of binoculars inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)
A masked pro-Russian protester poses inside a regional government building in Donetsk
A masked pro-Russian protester sits on a chair as he poses for a picture inside a regional government building in Donetsk, eastern Ukraine April 25, 2014. Picture taken April 25, 2014. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST PORTRAIT)