World leaders gather for the 2012 NATO Summit on May 20, 2012 in Chicago. UPI/Brian Kersey
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Afghanistan president Hamid Karzai (L) talks with US President Barack Obama before the start of the 2012 NATO Summit on May 20, 2012 in Chicago. World leaders are participating the the two-day event to discuss international security and issues related to Afghanistan. UPI/Shawn Thew/Pool
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