Negotiations between Iran and the United States over Tehran’s rapidly advancing nuclear program are to return to the secluded sultanate of Oman

Negotiations between Iran and the United States over Tehran's rapidly advancing nuclear program will return on Saturday to the secluded sultanate of Oman, where experts on both sides will start hammering out the technical details of a possible deal.

The United States and Iran are set to begin a third round of nuclear talks this weekend, entering what experts describe as a more difficult phase of technical negotiations as Washington lays out stricter conditions.