US President Barack Obama (L) and Russian President Dmitry Medvedev shake hands after they signed the new Strategic Arms Reduction Treaty (START) in Prague on April 8, 2010. Obama and Medvedev signed the treaty on April 8, committing their nations to major nuclear arms cuts and boosting Obama’s drive for a world without atomic weapons. AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

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