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US President Barack Obama and Russian President Vladimir Putin shake hands during their meeting at the G8 Summit at Lough Erne in Enniskillen, Northern Ireland, June 17, 2013 (Credit: Reuters/Kevin Lamarque)

US President Barack Obama and Russian President Vladimir Putin shake hands during their meeting at the G8 Summit at Lough Erne in Enniskillen, Northern Ireland, June 17, 2013 (Credit: Reuters/Kevin Lamarque)