Iranian Foreign Minister Mohammad Javad Zarif will fly back to Tehran and is expected to return by Tuesday to Vienna where negotiators are still at odds on some elements of a final nuclear deal, including the scope of monitoring.
Zarif's shuttle diplomacy isn't unexpected and his return to the capital for instruction could be a good thing, according to a U.S. administration official who asked not to be named in line with diplomatic rules. Negotiators will probably miss their June 30 deadline, said the source, confirming earlier reports.
"Tough choices will have to be made by all of us," U.K. Foreign Secretary Philip Hammond told reporters on Sunday before joining the talks. "There are a number of different areas where we have major differences of interpretation in the details."