German Defence Minister von der Leyen welcomes OSCE observers John Christensen (C) from Denmark Germany's Axel Schneider (2nd L) and unidentified observers in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen (L) welcomes OSCE observers John Christensen (C) from Denmark Germany's Axel Schneider (2nd L) and unidentified observers 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 MILITARY)
Denmark's Defence Minister Wammen gives a statement to the media with OSCE observer Christensen from Denmark in Berlin's Tegel airport
Denmark's Defence Minister Nicolai Wammen (L) gives a statement to the media with OSCE observer John Christensen from Denmark 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)
Denmark's Defence Minister Wammen gives a statement to the media with OSCE observer Christensen from Denmark in Berlin's Tegel airport
Denmark's Defence Minister Nicolai Wammen (R) gives a statement to the media with OSCE observer John Christensen (L) from Denmark 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)
German Defence Minister von der Leyen leaves a statement to the media with OSCE observers Christensen from Denmark and Germany's Schneider in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen (R) leaves a statement to the media with OSCE observers John Christensen (L) from Denmark and Germany's Axel Schneider (C) 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)
Ukrainian soccer celebrations ended in Odessa deaths
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OSCE observer Schneider looks on after arriving to Berlin's Tegel airport
OSCE observer Axel Schneider looks on after arriving to 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 HEADSHOT)
German Defence Minister von der Leyen speaks to media next to her Czech counterpart Stropnicky and OSCE observer Schneider (C) in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen speaks to media next to her Czech counterpart Martin Stropnicky (R) and OSCE observer Axel Schneider (C) 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)
German Defence Minister von der Leyen walks with OSCE observer Schneider in Berlin's Tegel airport
German Defence Minister Ursula von der Leyen walks with OSCE observer Axel Schneider 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 TPX IMAGES OF THE DAY)
Armed pro-Russian activist patrols street near the seized regional government headquarters in Luhansk
An armed pro-Russian activist patrols a street 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 activist holds a child near the seized regional government headquarters in Luhansk
An armed pro-Russian activist holds a child 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)