This would not be an easy process, and could well meet considerable Iranian resistance. But the Iranians have diplomatic relations with other members of its main interlocutor in talks on its nuclear program, the sanctions-minded P-5+1 Group (China, France, Germany, Russia, the United Kingdom, and the US), and restoring Iran-US diplomatic ties would shorten lines of communications and close the 444-day chapter of 1979-1981.