Pro-Ukranian activists sing the Ukrainian anthem during a rally in Luhansk
Pro-Ukranian activists sing the Ukrainian anthem during a rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian protesters attack a pro-Ukranian protester during a pro-Ukraine rally in the eastern city of Donetsk
Pro-Russian protesters attack a pro-Ukranian protester during a pro-Ukraine rally in the eastern city of Donetsk April 28, 2014. Several people were wounded when what appeared to be stun grenades exploded during a rally in support of Ukrainian unity in the eastern, separatist-held city of Donetsk on Monday, a Reuters reporter said. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A Pro-Russian activist stands during a rally in Luhansk
A Pro-Russian activist stands during a rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian protesters attack a pro-Ukranian protester during a pro-Ukrainian rally in the eastern city of Donetsk
Pro-Russian protesters attack a pro-Ukranian protester during a pro-Ukrainian rally in the eastern city of Donetsk April 28, 2014. Several people were wounded when what appeared to be stun grenades exploded during a rally in support of Ukrainian unity in the eastern, separatist-held city of Donetsk on Monday, a Reuters reporter said. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Pro-Russian activists rally in Luhansk
Pro-Russian activists rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists rally in Luhansk
Pro-Russian activists rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists walk in Luhansk
Pro-Russian activists walk in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists gather during a rally in Luhansk
Pro-Russian activists gather during a rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered to rally at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian activists gesture during a rally in Luhansk
Pro-Russian activists gesture during a rally in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered to rally at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST) TEMPLATE OUT
Armed Ukranian policemen and citizens stand in Luhansk
Armed Ukranian policemen and citizens stand in Luhansk, eastern Ukraine, April 28, 2014. Several dozen pro-Russian and pro-Ukranian activists argued and exchanged threats as they gathered at the same place in the city. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)