US President Barack Obama (L) speaks with Russian President Dmitry Medvedev during their meeting before the signing ceremony of a landmark nuclear disarmament treaty in Prague on April 8, 2010. Obama and Medvedev are to sign a treaty on April 8, slashing their nations’ atomic arsenals and boosting Obama’s vision of a nuclear-free world. AFP PHOTO / YURI KADOBNOV (Photo credit should read YURI KADOBNOV/AFP/Getty Images)

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