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‘British Foreign Secretary Philip Hammond, 2nd right, U.S. Secretary of State John Kerry, right, and European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, left, talk to Iranian Foreign Minister Mohammad Javad Zarif as the wait for Russian Foreign Minister Sergey Lavrov, not pictured, for a group picture at the Vienna International Center in Vienna, Austria, July 14, 2015 (Credit: AP Photo/Carlos Barria)

'British Foreign Secretary Philip Hammond, 2nd right, U.S. Secretary of State John Kerry, right, and European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, left, talk to Iranian Foreign Minister Mohammad Javad Zarif as the wait for Russian Foreign Minister Sergey Lavrov, not pictured, for a group picture at the Vienna International Center in Vienna, Austria, July 14, 2015 (Credit: AP Photo/Carlos Barria)