A Russian flag flies from a window of the local administration building in the northeastern city of Kharkiv, Ukraine, Saturday, March 1, 2014. Supporters of new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv, a mostly Russian-speaking region in eastern Ukraine. (AP Photo/Olga Ivashchenko)

Pro-Russian activists put Russian flags over the administration office in the center of Donetsk, Ukraine, Saturday, March 1, 2014. Supporters of the new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv and Donetsk a mostly Russian-speaking region in eastern Ukraine. (AP Photo/Sergey Vaganov)

Pro-Russian activists hold Russian flags during a rally in the center of Donetsk, Ukraine, Saturday, March 1, 2014. Supporters of new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv and Donetsk a mostly Russian-speaking region in eastern Ukraine. (AP Photo/Sergey Vaganov)

Pro-Western activists, one of them covering his head with a Ukrainian flag, sit after being overpowered by pro-Russia activists after clashes at the local administration building in the northeastern city of Kharkiv, Ukraine, Saturday, March 1, 2014. Supporters of new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv, a mostly Russian-speaking region in eastern Ukraine. (AP Photo/Olga Ivashchenko)

Pro-Russian activists remove the Ukrainian flag, center, to replace it with a Russian one on an administration office in the center of Donetsk, Ukraine, Saturday, March 1, 2014. Supporters of new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv and Donetsk a mostly Russian-speaking region in eastern Ukraine. (AP Photo/Sergey Vaganov)

Pro-Russian activists hold Russian flags during a rally in center of Donetsk, Ukraine, Saturday, March 1, 2014. Supporters of new Ukrainian authorities and pro-Russia demonstrators clashed in Kharkiv and Donetsk a mostly Russian-speaking region in eastern Ukraine. Poster at right reads: "Donetsk with Russia." (AP Photo/Sergey Vaganov)

TOPSHOTS Unidentified masked individuals hold a Russian flag as they block the Trade Union building in Simferopol, the administrative center of Crimea, on March 1, 2014. Russia's parliament on March 1 gave President Vladimir Putin the go-ahead to send troops into Ukraine, despite a warning from Washington that such a deployment would results in "costs" for Moscow. The stark escalation of the ex-Soviet country's three-month political crisis came amid growing instability in Ukraine's predominantly Russian peninsula of Crimea that has housed Kremlin navies for nearly 250 years. AFP PHOTO/ GENYA SAVILOV

Maidan supporters rebuff the attack of pro-Russian activists stormng a local government building in Kharkiv on March 1, 2014. Dozens were hurt Saturday when a pro-Russia protest in Ukraine's eastern city of Kharkiv turned violent, with demonstrators trying to storm the local government building, an AFP reporter said. Some 20,000 joined the protest against Kiev's new pro-West government after the ouster of Kremlin-backed leader Viktor Yanukovych, and later around 300 launched the assault on the government building. Stones and stun grenades were thrown though it was unclear by whom. AFP PHOTO/ MIKHAIL KUCHNEV

Policemen try to stop pro-Russian activists stormng a local government building in Kharkiv on March 1, 2014. Dozens were hurt Saturday when a pro-Russia protest in Ukraine's eastern city of Kharkiv turned violent, with demonstrators trying to storm the local government building, an AFP reporter said. Some 20,000 joined the protest against Kiev's new pro-West government after the ouster of Kremlin-backed leader Viktor Yanukovych, and later around 300 launched the assault on the government building. Stones and stun grenades were thrown though it was unclear by whom. AFP PHOTO/ MIKHAIL KUCHNEV