The NATO leaders gather as the opening session of the NATO Summit begins in Chicago, Sunday, May 20, 2012. (AP Photo/Christophe Ena)

Associated Press
The NATO leaders gather as the opening session of the NATO Summit begins in Chicago, Sunday, May 20, 2012. (AP Photo/Christophe Ena)
The NATO leaders gather as the opening session of the NATO Summit begins in Chicago, Sunday, May 20, 2012. (AP Photo/Christophe Ena)
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