Russian President Vladimir Putin (C) addresses the audience during a festive concert marking the first anniversary of the Crimean treaty signing in central Moscow, March 18, 2015. Putin said on Wednesday his country, hit by Western economic sanctions over the Ukraine crisis, would overcome all difficulties from outside. "We will overcome all problems and difficulties that they try to throw at us from outside," Putin told a large crowd at a concert near the Kremlin commemorating the first anniversary of Crimea's incorporation into Russia. [Photo/Agencies]