Members of pro-Russian self-defence units stand in front of the local parliament in the Crimean capital of Simferopol March 7, 2014. Russia said any U.S. sanctions imposed on Moscow over the crisis in Ukraine will boomerang back on the United States and that Crimea has the right to self-determination as armed men tried to seize another Ukrainian military base on the peninsula. REUTERS/Thomas Peter (UKRAINE - Tags: POLITICS RELIGION)