Sultan Haitham bin Tariq Al Said is visiting Russia ahead of a third round of talks between Tehran and Washington.

The talks seek to limit Iran's nuclear program in exchange for the lifting of some of the crushing economic sanctions the U.S. has imposed on the Islamic Republic.

Iran and the United States held their first technical-level talks on Tehran’s rapidly advancing nuclear program Saturday, a more complex phase of their high-stakes negotiations. “The negotiations this round were much more serious than in the past,