U.S. President Barack Obama, left, gets a reaction from Russian President Dmitry Medvedev, right, after jokingly covering up his microphone as they attend the opening plenary session at the Nuclear Security Summit at the Coex Center, in Seoul, South Korea, Tuesday, March 27, 2012. Sitting in the center is South Korean President Lee Myung-bak. (AP Photo/Pablo Martinez Monsivais)

Associated Press
U.S. President Barack Obama, left, gets a reaction from Russian President Dmitry Medvedev, right, after jokingly covering up his microphone as they attend the opening plenary session at the Nuclear Security Summit at the Coex Center, in Seoul, South Korea, Tuesday, March 27, 2012. Sitting in the center is South Korean President Lee Myung-bak. (AP Photo/Pablo Martinez Monsivais)
U.S. President Barack Obama, left, gets a reaction from Russian President Dmitry Medvedev, right, after jokingly covering up his microphone as they attend the opening plenary session at the Nuclear Security Summit at the Coex Center, in Seoul, South Korea, Tuesday, March 27, 2012. Sitting in the center is South Korean President Lee Myung-bak. (AP Photo/Pablo Martinez Monsivais)
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