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U.S. President Barack Obama, left, chats with Russian President Dmitry Medvedev during a bilateral meeting at the Nuclear Security Summit in Seoul, South Korea, Monday, March, 26, 2012. (AP Photo/Pablo Martinez Monsivais)

U.S. President Barack Obama, left, chats with Russian President Dmitry Medvedev during a bilateral meeting at the Nuclear Security Summit in Seoul, South Korea, Monday, March, 26, 2012. (AP Photo/Pablo Martinez Monsivais)

Seoul nuclear security summit

Russia's president Dmitry Medvedev spoke with nation leader at the 2012 Nuclear Security Summit in Seoul, South Korea on Mar. 27