VIENNA, AUSTRIA - JULY 14:   EU High Representative for Foreign Affairs and Security Policy Federica Mogherini, and Foreign Minister of Iran, Mohammad Javad Zarif,  attend last Working Session of E 3+3 negotiations on July 14, 2015 in Vienna, Austria.  Six world powers; US, UK, France, China, Russia and Germany have reached a deal with Iran on limiting Iranian nuclear activity.  (Photo by Thomas Imo/Photothek via Getty Images)