In the weeks since the Ukraine crisis began, culminating in Tuesday’s decision by Russia to annex Crimea, President Vladimir Putin has ignored every gauntlet the United States and its European allies have laid down. The challenge now facing the Obama administration is whether any measures it is prepared to take can deter Russia from moving beyond Crimea into the rest of Ukraine.
Washington Post: As U.S. ponders next moves on Crimea, experts rethink NATO’s defense posture
Russia's President Vladimir Putin
