VIENNA (AP) — Any thaw in relations between Iran and the United States under the pressure of Iraq’s turmoil is unlikely to hasten progress in difficult negotiations seeking limits on Tehran’s nuclear program.

Recent high-level U.S.-Iran talks that were meant to pave the way to a final nuclear deal only highlighted the two nations’ huge differences, say two diplomats, further diminishing expectations that a July 20 target date for agreement will be met.