Iranian delegation in New York

Iranian President Hassan Rouhani, right, and Foreign Minister Mohammad Javad Zarif, shown here at a discussion with academics during their U.S. visit last month, have brought a more conciliatory tone to the debate with Western powers over Iran's nuclear programs. Still, negotiations that resume Tuesday have huge obstacles to overcome to reach a deal that would satisfy foreign fears that Tehran seeks nuclear weapons and Iran's urgent need to get crippling economic sanctions lifted.
Emmanuel Dunand / AFP/Getty Images
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