The United States expects indirect talks with Iran that begin on Tuesday about both sides resuming compliance with the 2015 Iran nuclear deal to be "difficult" and does not foresee any early breakthrough.
"We don't underestimate the scale of the challenges ahead," U.S. State Department spokesman Ned Price said on Monday.
"These are early days. We don't anticipate an early or immediate breakthrough as these discussions, we fully expect, will be difficult," he told reporters.