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U.S. Secretary of State John Kerry (L)  meets with Iranian Foreign Minister Javad Zarif at a hotel in Vienna, Austria June 30, 2015.  Kerry and  Zarif held a "productive" meeting in Vienna on Tuesday, the State Department said, as negotiations on curbing Iran's nuclear program were extended. REUTERS/State Department/Handout  FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS - RTX1IHEE © Handout . / Reuters