In Vienna on Monday, Iran nuclear negotiations are back. Since the US pulled out of the deal in 2015, Iran has continued to enrich uranium and build up its nuclear program. Leaders in Tehran say that its nuclear work is for atomic energy and other peaceful purposes. The US has added sanctions against Iran, yet the Biden administration has said that it would like to find a path toward rejoining the deal. Host Marco Werman speaks with Crisis Group’s senior Iran analyst Naysan Rafati.