Members from the Ukrainian Interior Ministry security forces stand guard outside a trade union building in Odessa
Members from the Ukrainian Interior Ministry security forces 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 CRIME LAW)
Ukrainian Interior Ministry security forces member looks on outside a trade union building in Odessa
Ukrainian Interior Ministry security forces member looks on 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 CRIME LAW)
Russia calls on U.S. to help stop Kiev's military drive
UKRAINE-CRISIS/LAVROV-KERRY (UPDATE 1):UPDATE 1-Russia calls on U.S. to help stop Kiev's military drive
Members from the Ukrainian Interior Ministry security forces stand guard outside a trade union building in Odessa
Members from the Ukrainian Interior Ministry security forces 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 CRIME LAW)
Ukrainian Interior Ministry security forces members stand guard outside a 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 CRIME LAW)
Pro-Russia protesters storm the governor's business premises in Donetsk, eastern Ukraine
Pro-Russia protesters storm the governor's business premises in Donetsk, eastern Ukraine May 3, 2014. A couple of hundred pro-Russian protesters in the eastern city of Donetsk stormed the governor's business premises and the state security headquarters, ransacking files and smashing windows. The attack reflected growing disorder in the area, targeting as it did a security building that was already largely under rebel control. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian Interior Ministry security forces members stand guard outside a 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 CRIME LAW)
Ukraine's Prime Minister Yatseniuk and OSCE observers attend a welcoming ceremony and a news conference at Boryspil International airport outside Kiev
Ukraine's Prime Minister Arseny Yatseniuk (L, front) and OSCE observers attend a welcoming ceremony and a news conference at Boryspil International airport outside Kiev 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/Maks Levin (UKRAINE - Tags: POLITICS CIVIL UNREST)
Woman lays flowers as Ukrainian Interior Ministry security forces members stand guard outside a trade union building in Odessa
A woman lays flowers as 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 CRIME LAW)
Ukrainian Interior Ministry security forces members stand guard outside a 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 CRIME LAW TPX IMAGES OF THE DAY)