Iranian President Hassan Rouhani’s brother and aide, Hossein Fereydoun, will join nuclear negotiators in Vienna on Tuesday as diplomats say an accord between the Islamic Republic and world powers is within reach. Fereydoun is traveling to the Austrian capital along with Foreign minister Mohammad Javad Zarif and Ali Akbar Salehi, the head of Iran’s atomic energy agency, Fars news agency reported. Salehi returns to the talks after undergoing intestinal surgeries last month. “This is the most crucial round of this 22-month long process,” said Ali Vaez, senior Iran analyst at the International Crisis Group. “It is not surprising that the Iranians need to have all hands on deck.” Salehi, who studied nuclear physics at the Massachusetts Institute of Technology in the 1970, negotiated technical details with U.S. officials in previous rounds, including with Secretary of Energy Ernest Moniz. Salehi and Moniz’s “chemistry has so far proven extremely effective in […]