Switzerland announced Friday that follow-up negotiations on the recently signed accord to end the Middle East war have been postponed, just hours after U.S. Vice President JD Vance’s planned trip to the Alpine nation was cancelled.

The agreement, signed earlier this week by U.S. President Donald Trump and Iranian President Masoud Pezeshkian, was designed to halt fighting in Iran, reopen the Strait of Hormuz, and launch a 60-day dialogue on broader issues, including Tehran’s nuclear program. It also aimed to stop hostilities in Lebanon, though Israel’s military reported fresh strikes against Hezbollah positions in southern Lebanon on Friday.

“The planned talks between the U.S., Iran, Qatar and Pakistan have been postponed,” Switzerland’s foreign ministry said, adding that preparations at Burgenstock continue but no new date has been set.

The White House confirmed late Thursday that Vance’s trip was cancelled, citing the unpredictable logistics of the negotiations. “We look forward to beginning technical talks as soon as possible,” a spokesperson said.

Iran’s Tasnim news agency reported that “nothing has been confirmed” regarding Tehran’s delegation traveling to Switzerland. Meanwhile, Supreme Leader Ayatollah Mojtaba Khamenei—who assumed power after his father Ali Khamenei was killed in an airstrike on February 28—acknowledged approving the accord despite reservations. He emphasized that his decision was based on assurances from Iranian officials to safeguard national interests, while warning that future face-to-face talks with Washington would not mean “accepting the enemy’s point of view.”

Iran’s chief negotiator Mohammad Bagher Ghalibaf reinforced that stance Friday, warning Tehran would deliver a “decisive” response if the agreement were violated.