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U.S. President Barack Obama frowns during a meeting with Russian President Vladimir Putin at the 2012 G-8 Summit in Los Cabos, Mexico, June 18, 2012 (Credit: Reuters/Jason Reed)

U.S. President Barack Obama frowns during a meeting with Russian President Vladimir Putin at the 2012 G-8 Summit in Los Cabos, Mexico, June 18, 2012 (Credit: Reuters/Jason Reed)