Ukraine crisis: Waiting for Putin's next move

Following Russia's annexation of the Crimea, the West is trying to work out what the Kremlin's next move will be.

President Obama has expressed concern about Russia's troop build-up on the Ukrainian border, accusing Moscow of intimidating Kiev.

Moscow correspondent Steve Rosenberg assesses President Putin's strategy in what has become an increasingly tense "geo-political chess game" between East and West.