Masked pro-Russian activists guard a barricade outside the regional state building seized by separatists in the eastern Ukrainian city of Donetsk Saturday. Pro-Russian forces holding a group of international observers have accused them of being "NATO spies." Alexander Khudoteply/AFP/Getty Images hide caption

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Ousted Ukrainian President Viktor Yanukovych during an interview with The Associated Press, in Rostov-on-Don, Russia, on Wednesday. He said he hoped to persuade Russian President Vladimir Putin to return Crimea to Ukraine. Ivan Sekretarev/AP hide caption

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NATO Secretary General Anders Fogh Rasmussen looks on at the start of a NATO foreign ministers meeting at the Alliance headquarters in Brussels on Tuesday. Francois Lenoir/Reuters/Landov hide caption

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An Afghan security officer runs toward the scene of Friday's bombing in Kabul. Three NATO personnel were killed and at least six Afghan civilians were wounded. Omar Sobhani /Reuters /Landov hide caption

itoggle caption Omar Sobhani /Reuters /Landov

Afghan National Army Commandos attend their graduation ceremony in Kabul in July. Foreign combat troops are set to leave Afghanistan by the end of 2014 after handing over all security responsibilities to Afghan forces. S. Sabawoon/EPA/Landov hide caption

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Anti-war protesters rally outside Downing Street in London on Wednesday. Britain's Parliament rejected the country's involvement in any military action against Syria. The U.K. government had been among those seeking a strong response to the alleged use of chemical weapons in Syria. Matt Dunham/AP hide caption

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The scene Thursday in Kabul, Afghanistan, after a suicide bomber attacked a NATO convoy. Zhao Yishen /Xinhua /Landov hide caption

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A suicide bomber struck a convoy of buses today in Kabul, killing at least 12 people — mostly foreigners. Massoud Hossaini /AFP/Getty Images hide caption

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Aug. 13: At Dover Air Force Base in Delaware, the remains of Marine Lance Cpl. Gregory T. Buckley are carried during a dignified transfer. He was killed in a "green on blue" attack. Mark Wilson/Getty Images hide caption

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President Obama shakes hands with with Afghan President Hamid Karzai during their meeting at the NATO Summit in Chicago on Sunday. The summit, which continues Monday, is focusing heavily on Afghanistan's future. Pablo Martinez Monsivais/AP hide caption

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A soldier from the U.S. Army's 101st Airborne Division on patrol in southern Afghanistan. (October, 2010, file photo.) Chris Hondros/Getty Images hide caption

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An elderly Afghan man sits next to the covered body of a person who was allegedly killed by a U.S. service member in Panjwai, Kandahar province south of Kabul, Afghanistan, on Sunday, March 11, 2012. Allauddin Khan/AP hide caption

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An Afghan demonstrator holds a copy of a half-burnt Quran, allegedly set on fire by soldiers at Bagram Air Field, during a protest outside the base today. Massoud Hossaini /AFP/Getty Images hide caption

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