US President Barack Obama flanked(C) by China's President Xi Jinping (R) and France's President Francois Hollande (L) take part in a P5+1 meeting during the Nuclear Security Summit at the Walter E. Washington Convention Center on April 1, 2016 in Washington, DC. Clockwise from right: European Council President Donald Tusk, Germany's Defence Minister Ursula von der Leyen, European Union High Representative for Foreign Affairs Federica Mogherini, Russia's Ambassador to the US Sergey Kislyak, International Atomic Energy Agency Director General Yukiya Amano, US Secretary of State John Kerry, and Britain's Prime Minister David Cameron. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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