Pro-Russian suppoters take part in a memorial service in Luhansk
Pro-Russian supporters take part in a memorial service in Luhansk, eastern Ukraine, May 3, 2014. At least 42 people were killed in street battles between supporters and opponents of Russia in southern Ukraine that ended with pro-Russian protesters trapped in a flaming building, bringing the country closer to war. The riot in the Black Sea port of Odessa that ended in a deadly blaze in a trade union building was by far the worst incident in Ukraine since a February uprising that ended with a pro-Russian president fleeing the country. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
OSCE observer Schneider is escorted after being freed by pro-Russian separatists in the town of Slaviansk
OSCE observer Axel Schneider (C) is escorted after being freed by pro-Russian separatists in the town of Slaviansk in eastern Ukraine May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Mathieu Radoube (UKRAINE - Tags: POLITICS CIVIL UNREST)
A woman stands next to flowers and lit candles placed in memory of people killed in recent street battles outside trade union building in Odessa
A woman stands next to flowers and lit candles placed in memory of people killed in recent street battles outside a trade union building in Odessa, May 3, 2014. At least 42 people were killed in street battles between supporters and opponents of Russia in southern Ukraine that ended with pro-Russian protesters trapped in a flaming building, bringing the country closer to war. The riot in the Black Sea port of Odessa that ended in a deadly blaze in a trade union building was by far the worst incident in Ukraine since a February uprising that ended with a pro-Russian president fleeing the country. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
An OSCE observer talks to Ponomaryov, the de facto mayor of Slaviansk, after being freed by pro-Russian separatists in Slaviansk
An OSCE observer (L) talks to Vyacheslav Ponomaryov, the de facto mayor of Slaviansk, after being freed by pro-Russian separatists in the town of Slaviansk in eastern Ukraine May 3, 2014. A group of military observers who were seized last week by pro-Russian separatists in Slaviansk has been released, the Organization for Security and Cooperation in Europe (OSCE) confirmed on Saturday. REUTERS/Mathieu Radoube (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Ukrainian Interior Ministry security forces members stand guard outside trade union building in Odessa
Ukrainian Interior Ministry security forces members stand guard outside a trade union building in Odessa, May 3, 2014. At least 42 people were killed in street battles between supporters and opponents of Russia in southern Ukraine that ended with pro-Russian protesters trapped in a flaming building, bringing the country closer to war. The riot in the Black Sea port of Odessa that ended in a deadly blaze in a trade union building was by far the worst incident in Ukraine since a February uprising that ended with a pro-Russian president fleeing the country. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian Interior Ministry security forces members stand guard outside trade union building in Odessa
Ukrainian Interior Ministry security forces members stand guard outside a trade union building in Odessa, May 3, 2014. At least 42 people were killed in street battles between supporters and opponents of Russia in southern Ukraine that ended with pro-Russian protesters trapped in a flaming building, bringing the country closer to war. The riot in the Black Sea port of Odessa that ended in a deadly blaze in a trade union building was by far the worst incident in Ukraine since a February uprising that ended with a pro-Russian president fleeing the country. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukraine says heavy fighting in Kramatorsk, war descends in its east
UKRAINE-CRISIS/KRAMATORSK (URGENT):Ukraine says heavy fighting in Kramatorsk, war descends in its east
A woman argues with Ukrainian Interior Ministry security forces members during rally outside a trade union building in Odessa
A woman argues with Ukrainian Interior Ministry security forces members during a rally outside a trade union building in Odessa, May 3, 2014. At least 42 people were killed in street battles between supporters and opponents of Russia in southern Ukraine that ended with pro-Russian protesters trapped in a flaming building, bringing the country closer to war. The riot in the Black Sea port of Odessa that ended in a deadly blaze in a trade union building was by far the worst incident in Ukraine since a February uprising that ended with a pro-Russian president fleeing the country. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Ukraine says Odessa unrest planned by and financed from abroad
UKRAINE-CRISIS/INTERFERENCE (URGENT):Ukraine says Odessa unrest planned by and financed from abroad
Kremlin says Kiev, West responsible for Odessa bloodshed - agencies
UKRAINE-CRISIS/RUSSIA-KREMLIN (UPDATE 1):UPDATE 1-Kremlin says Kiev, West responsible for Odessa bloodshed - agencies