Ukraine

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A pro-Russian masked armed man guards at the city hall in Kostyantynivka, 35 kilometers (22 miles) south of Slovyansk, eastern Ukraine, Monday, April 28, 2014, after masked militants with automatic weapons seized the hall building. (AP Photo/Sergei Grits)

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Axel Schneider of Germany, foreground, leads a group of foreign military observers escorting by Vacheslav Ponomarev, the self-proclaimed mayor of Slovyansk, right, ahead of a press conference in city hall, Slovyansk, eastern Ukraine, Sunday, April 27, 2014. Germany's foreign minister has condemned as "revolting" the appearance under armed guard of eight European military observers being held prisoner by pro-Russian separatists in eastern Ukraine. (AP Photo/Alexander Zemlianichenko)

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Under a statue of former Soviet leader Vladimir Lenin, a pro Russia masked man is seen while protecting the stage during a pro Russia rally at Lenin square in Donetsk, Ukraine, Sunday, April 27, 2014. Insurgents in Slovyansk have taken a number of people hostage, including journalists and pro-Ukraine activists, as they strengthen their control in the east of the country in defiance of the interim government in Kiev and its Western supporters.(AP Photo/Manu Brabo)

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Masked pro-Russian activists control the entrance during their mass storming of a regional Television Centre in Donetsk, Ukraine, Sunday, April 27, 2014. Insurgents in Slovyansk have taken a number of people hostage, including journalists and pro-Ukraine activists, as they strengthen their control in the east of the country in defiance of the interim government in Kiev and its Western supporters.(AP Photo/Efrem Lukatsky)

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Masked pro-Russian activists guard the entrance during their mass storming of a regional Television Centre in Donetsk, Ukraine, Sunday, April 27, 2014. Insurgents in Slovyansk have taken a number of people hostage, including journalists and pro-Ukraine activists, as they strengthen their control in the east of the country in defiance of the interim government in Kiev and its Western supporters. (AP Photo/Efrem Lukatsky)

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Masked pro Russian armed men stand at the city hall during negotiations about the release of foreign military observers being held by Ponomarev's group in Slovyansk, eastern Ukraine, Sunday, April 27, 2014. At least one of the eight European military observers held prisoner by pro-Russia insurgents in eastern Ukraine has been freed. Earlier in the day, the eight observers had been shown in public for the first time since they were detained on Friday and accused of spying for NATO. (AP Photo/Sergei Grits)

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Soldiers of Ukrainian army seen atop an APC at their checkpoint near village of Malinovka, 20 kilometers (12,5 miles) from Slovyansk, eastern Ukraine, Sunday, April 27, 2014. Insurgents in Slovyansk have taken a number of people hostage, including journalists and pro-Ukraine activists, as they strengthen their control in the east of the country in defiance of the interim government in Kiev and its Western supporters. (AP Photo/Sergei Grits)

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A soldier of the Ukrainian army guards their checkpoint near village of Malinovka, 20 kilometers (12,5 miles) from Slovyansk, eastern Ukraine, Sunday, April 27, 2014. Insurgents in Slovyansk have taken a number of people hostage, including journalists and pro-Ukraine activists, as they strengthen their control in the east of the country in defiance of the interim government in Kiev and its Western supporters. (AP Photo/Sergei Grits)