CAPTION ADDITION, ADDS ID OF MAN AT SECOND LEFT - Vacheslav Ponomarev, the self-proclaimed mayor of Slovyansk, second right, speaks, as he is surrounded by a group of foreign military observers, including Axel Schneider, second from left, who are being held by Ponomarev's group during a press conference in city hall, Slovyansk, eastern Ukraine, Sunday, April 27, 2014. As Western governments vowed to impose more sanctions against Russia and its supporters in eastern Ukraine, a group of foreign military observers remained in captivity Saturday accused of being NATO spies by a pro-Russian insurgency. The German-led, eight-member team was traveling under the auspices of the Organization of Security and Cooperation in Europe when they were detained Friday. (AP Photo/Alexander Zemlianichenko)
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