NATO leaders are gathering in Chicago for the annual summit, amid heavy protesting.
NATO Leaders Gather In Chicago
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Demonstrators flow out of Grant Park in Chicago during this weekend's NATO summit Sunday, May 20, 2012 in Chicago.
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U.S. President Barack Obama during a meeting with Afghanistan's President Hamid Karzai at the NATO Summit at McCormick Place in Chicago, May 20, 2012.
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Leaders watch a ceremony honoring NATO military personnel for their service the NATO Summit meeting in Chicago, May 20, 2012.
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NATO Secretary-General Anders Fogh Rasmussen arrives at the NATO Summit in Chicago, May 21, 2012.