Tough Nuclear Talks Await Iran, U.S. as Powers Gather in Vienna

  • U.S. official says it doesn’t foresee quick breakthrough
  • U.S. Iran envoy Malley to lead talks on behalf of White House

Javad Zarif, Iran' Foreign Minister Mohammad, left, meets with Rafael Grossi, director general of the International Atomic Energy Agency (IAEA), right,  in Tehran on Feb. 21.

Photographer: Stringer/AFP/Getty Images

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Iran and the U.S. face difficult talks as diplomats prepare their latest efforts to end a crisis over the future of the 2015 nuclear deal.