German Defence Minister von der Leyen watches as OSCE observer Schneider embraces a friend in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen (L) watches as OSCE observer Axel Schneider (2R) embraces a friend in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk, eastern Ukraine
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk, eastern Ukraine, May 3, 2014. A gunfight started between pro-Russian activists and what witnesses say are Ukrainian police, near the building of the regional military commissariat. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Armed pro-Russian activist holds his weapon as he stands near the seized regional government headquarters in Luhansk
An armed pro-Russian activist holds his weapon as he stands near the seized regional government headquarters in Luhansk, eastern Ukraine, May 3, 2014. A gunfight started between pro-Russian activists and what witnesses say are Ukrainian police, near the building of the regional military commissariat. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
OSCE observer Schneider leaves the plane in Berlin's Tegel airport
OSCE observer Axel Schneider leaves the plane in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)
OSCE observer Schneider leaves the plane in Berlin's Tegel airport
OSCE observer Axel Schneider leaves the plane in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk, eastern Ukraine, May 3, 2014. A gunfight started between pro-Russian activists and what witnesses say are Ukrainian police, near the building of the regional military commissariat. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk
Armed pro-Russian activists stand near the seized regional government headquarters in Luhansk, eastern Ukraine, May 3, 2014. A gunfight started between pro-Russian activists and what witnesses say are Ukrainian police, near the building of the regional military commissariat. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Armed pro-Russian activists take positions in Luhansk
Armed pro-Russian activists take positions in Luhansk, eastern Ukraine, May 3, 2014. A gunfight started between pro-Russian activists and what witnesses say are Ukrainian police, near the building of the regional military commissariat. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
A German government plane with released military observers aboard lands in Berlin's Tegel airport
A German government plane with released military observers aboard lands in Berlin's Tegel airport, May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in the eastern Ukrainian city of Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS CIVIL UNREST)
Members of the Russian Interior Ministry security forces attempt to block the way for Crimean Tatars who cross a checkpoint near Armyansk
Members of the Russian Interior Ministry security forces attempt to block the way for Crimean Tatars who cross a checkpoint connecting Crimea and Kherson region, to meet with former chairman of the Mejlis of the Crimean Tatars Mustafa Dzhemilev, near the city of Armyansk May 3, 2014. Crimea's Tatar community assembly accused Russia on April 22 of barring its leading political figure from returning to the peninsula following its annexation by Moscow. However, Russian officials declined comment and it was unclear whether Moscow had taken issued the banning order. In an online statement, the Mejlis of the Crimean Tatar People said Dzhemilev, a member of the Ukrainian parliament and the former chairman of the Mejlis, had been handed a notice banning him from Russia for five years as he crossed back to mainland Ukraine after a weekend in Crimea. REUTERS/Stringer (UKRAINE - Tags: CIVIL UNREST MILITARY POLITICS TPX IMAGES OF THE DAY)