The United States and Iran on Saturday concluded their third round of "indirect" nuclear talks mediated by host Oman with both sides seeing progress in reaching a deal.

Leaders from the United States and Iran painted a positive but cautious picture of talks between the nations over Iran’s nuclear program Saturday, after the third phase of the discussions wrapped up in Oman.

Washington opposes Tehran’s insistence on retaining the ability to enrich uranium, but U.S. calls latest round “productive.”