A top adviser to Iran’s Supreme Leader Ayatollah Ali Khamenei may join talks in Oman between the United States and Iran in the coming days, in a sign that a breakthrough may be imminent in reaching a nuclear deal, Al-Monitor has learned. Ali Akbar Velayati, longtime foreign policy adviser to Khamenei and a former Iranian foreign minister, may join the talks between US Secretary of State John Kerry, Iran’s Foreign Minister Mohammad Javad Zarif and European Union negotiator Catherine Ashton, in a signal that the Supreme Leader may be preparing to sign off on a deal, sources told Al-Monitor on...