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VIENNA, AUSTRIA - JANUARY 16 : Iranian Foreign Minister Mohammad Javad Zarif (R) and EU Foreign Policy Chief Federica Mogherini hold a press conference at the E3/EU+3 and Iran talks at the International Atomic Energy Agency headquarters in Vienna on January 16, 2016. (Photo by Hasan Tosun/Anadolu Agency/Getty Images)

VIENNA, AUSTRIA - JANUARY 16 :  Iranian Foreign Minister Mohammad Javad Zarif (R) and EU Foreign Policy Chief Federica Mogherini hold a press conference at the E3/EU+3 and Iran talks at the International Atomic Energy Agency headquarters in Vienna on January 16, 2016. (Photo by Hasan Tosun/Anadolu Agency/Getty Images)