I think Snowden>NSA_leaks>IRAN_DEAL
>In March 2013, the United States began a series of secret bilateral talks with Iranian officials in Oman, led by William Joseph Burns and Jake Sullivan on the American side and Ali Asghar Khaji on the Iranian side.[24][35] In June 2013, Hassan Rouhani was elected president of Iran.[24][36]
>U.S. Secretary of State John Kerry shakes hands with Iranian Foreign Minister Javad Zarif after the P5+1 and Iran concluded negotiations about Iran's nuclear capabilities on November 24, 2013