TEHRAN, IRAN - APRIL 3: Iranian Foreign Minister Mohammad Javad Zarif (C) greets people as nuclear negotiating committee arrive at Mehrabat Airport in Tehran on April 3, 2015, after the announcement of an agreement on Iran nuclear talks. Iran and six world powers have agreed on April 2 in Lausanne on the key points of a deal over Iran's controversial nuclear programme. (Photo by Fatemeh Bahrami/Anadolu Agency/Getty Images)
