FILE - In this Jan. 27, 2014 file photo, U.N. mediator Lakhdar Brahimi listens during a press briefing at the United Nations headquarters in Geneva, Switzerland. Brahimi will resign as the joint U.N.-Arab League envoy on Syria after a nearly two-year effort that failed to bring peace to the war-ravaged country, the U.N. chief announced Tuesday, May 13, 2014. He will step down May 31. (AP Photo/Anja Niedringhaus, File)
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