Head of the pro-Russian separatists government Pushilin speaks during a rally in Donetsk
Head of the pro-Russian separatists government Denis Pushilin speaks during a rally in Donetsk, Eastern Ukraine, April 27, 2014. U.S. President Barack Obama on Sunday said the United States and Europe must join forces to impose sanctions on Russia to stop it destabilising Ukraine, where armed pro-Russian separatists were for a third day holding eight international observers prisoner. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian activist holds a sign during a rally in Donetsk
A pro-Russian activist holds a sign during a rally in Donetsk, Eastern Ukraine, April 27, 2014. U.S. President Barack Obama on Sunday said the United States and Europe must join forces to impose sanctions on Russia to stop it destabilising Ukraine, where armed pro-Russian separatists were for a third day holding eight international observers prisoner. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists stand in front of a monument of Soviet leader Lenin during a rally in Donetsk
Pro-Russian activists stand in front of a monument of Soviet leader Vladimir Lenin during a rally in Donetsk, Eastern Ukraine, April 27, 2014. U.S. President Barack Obama on Sunday said the United States and Europe must join forces to impose sanctions on Russia to stop it destabilising Ukraine, where armed pro-Russian separatists were for a third day holding eight international observers prisoner. REUTERS/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk, Eastern Ukraine, April 27, 2014. Khodorkovsky attempted to talk to pro-Russian protesters in the eastern Ukraine city of Donetsk on Sunday but was stopped from entering the occupied regional administration building. REUTERS/Baz Ratner (UKRAINE - Tags: BUSINESS CIVIL UNREST POLITICS ENERGY)
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk, Eastern Ukraine, April 27, 2014. Khodorkovsky attempted to talk to pro-Russian protesters in the eastern Ukraine city of Donetsk on Sunday but was stopped from entering the occupied regional administration building. REUTERS/Baz Ratner (UKRAINE - Tags: BUSINESS CIVIL UNREST POLITICS ENERGY HEADSHOT)
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk
Former Russian oil tycoon Mikhail Khodorkovsky speaks during a news conference in Donetsk, Eastern Ukraine, April 27, 2014. Khodorkovsky attempted to talk to pro-Russian protesters in the eastern Ukraine city of Donetsk on Sunday but was stopped from entering the occupied regional administration building. REUTERS/Baz Ratner (UKRAINE - Tags: BUSINESS CIVIL UNREST POLITICS ENERGY)
Jewish demonstrators hold a rally in support of Holocaust Remembrance Day across the street from the Ukrainian Consulate in New York
Jewish demonstrators hold a rally in support of Holocaust Remembrance Day across the street from the Ukrainian Consulate in New York April 27, 2014. The demonstrators claim there has been a rise in anti-semitism in Ukraine recently. REUTERS/Carlo Allegri (UNITED STATES - Tags: CIVIL UNREST POLITICS)
Jewish demonstrators hold a rally in support of Holocaust Remembrance Day across the street from the Ukrainian Consulate in New York
Jewish demonstrators hold a rally in support of Holocaust Remembrance Day across the street from the Ukrainian Consulate in New York April 27, 2014. The demonstrators claim there has been a rise in anti-semitism in the Ukraine recently. REUTERS/Carlo Allegri (UNITED STATES - Tags: CIVIL UNREST POLITICS)
Pro-Russian activists block the entrance to a television station in Donetsk
Pro-Russian activists block the entrance to a television station in Donetsk, eastern Ukraine April 27, 2014. Pro-Russian separatists on Sunday seized control of the offices of regional state television in the eastern Ukrainian city of Donetsk, a Reuters reporter outside the building said. The reporter said four separatists in masks, with truncheons and shields, were standing at the entrance to the building controlling access, while more separatists in camouflage fatigues could be seen inside. REUTERS/Baz Ratner (UKRAINE - Tags: MEDIA CIVIL UNREST POLITICS)
Pro-Russian activists block the entrance to a television station in Donetsk
Pro-Russian activists block the entrance to a television station in Donetsk, eastern Ukraine April 27, 2014. Pro-Russian separatists on Sunday seized control of the offices of regional state television in the eastern Ukrainian city of Donetsk, a Reuters reporter outside the building said. The reporter said four separatists in masks, with truncheons and shields, were standing at the entrance to the building controlling access, while more separatists in camouflage fatigues could be seen inside. REUTERS/Baz Ratner (UKRAINE - Tags: MEDIA CIVIL UNREST POLITICS)