Protesters who oppose Russia's intervention in Ukraine's political crisis hold placards, one of them depicting Russia's President Vladimir Putin, during a rally outside the Russian embassy in Athens March 8, 2014. The mood darkened in Russian-occupied Crimea on Saturday after overnight confrontations between Russian troops and besieged Ukrainian soldiers raised tensions on the ground in the biggest East-West face-off since the Cold War. REUTERS/Alkis Konstantinidis