Obama phoned Russia's Vladimir Putin Thursday to discuss a US proposal for resolving the Ukraine crisis. Earlier, the US moved to begin a regimen of sanctions against Russia. Will those be enough to prevent Russia's annexation of Crimea?
[Updated 9:30 p.m. ET] President Obama appealed to Russian President Vladimir Putin late Thursday, during a personal phone call, to agree to direct talks with Ukraine aimed at resolving, through diplomacy rather than military confrontation, Russia's concerns about the future direction of the Ukrainian government and of the rights of ethnic Russians living in Ukraine.