Vacheslav Ponomarev, the self-proclaimed mayor of Slovyansk, fourth from left, is flnaked by a group of foreign military observers 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/Sergei Grits), APTOPIX