Swiss authorities announced on Thursday that a scheduled round of talks between U.S. and Iranian negotiators aimed at formalizing a pact to end the Middle East conflict would not take place on Friday, a development that came as Vice President JD Vance abandoned plans to travel to Switzerland. The abrupt change heightened doubts about whether the interim agreement can be converted into a lasting truce.
"The logistics of these negotiations have never been simple or predictable," a White House spokesperson said in a statement on Thursday, noting that Vance and the rest of the U.S. delegation had been prepared to depart for the talks at the Swiss mountaintop resort of Burgenstock as soon as arrangements were finalised.
A Swiss foreign ministry statement confirmed the postponement and said Switzerland remains ready to facilitate the negotiations. The ministry added that the relevant preparatory work at Burgenstock is continuing.
There was no immediate response from Iran to the Swiss announcement. Tehran had previously said it was ready to begin technical talks after the parties signed a 14-point accord that extended a fragile ceasefire by at least 60 days. But Iran’s negotiators indicated they first needed to see evidence that the United States was following through on the interim deal, and one semi-official news agency reported there was no confirmation that Iran’s delegation would travel to Switzerland prior to the U.S. update.
U.S. officials had said they planned to hold a formal signing ceremony for the memorandum in Switzerland, but Iran’s foreign ministry had questioned the necessity of such a ceremony after the presidents of both countries had already signed the agreement.
The conflict, which began on February 28 with air strikes by the U.S. and Israel on Iran, has had a steep human and economic toll. At least 7,000 people have died, energy prices spiked, and global markets were unsettled.
Israel, which was not part of the U.S.-Iran negotiations, has publicly distanced itself from the accord and has continued military operations against the Hezbollah militant group in Lebanon. Those strikes and Israel’s exclusion raise questions about the durability of any deal reached without its participation.
In Washington, some Republican allies of President Donald Trump in Congress have questioned whether the administration gave away too much to secure an end to a war that has become politically unpopular ahead of November mid-term elections. Critics cite a stark contrast with Mr. Trump’s March declaration that the war would end only with Iran’s "UNCONDITIONAL SURRENDER."
Instead, the memorandum contains a set of concessions to Iran: relief from certain economic sanctions, the unfreezing of assets described as worth tens of billions of dollars, and immediate U.S. waivers permitting Iran to export oil. Iran’s Supreme Leader, Ayatollah Mojtaba Khamenei, said Mr. Trump had signed the deal "out of desperation" and warned that negotiations on Iran’s nuclear programme would not be straightforward.
"If the American side wants to be too demanding, we will not accept it," the Supreme Leader said in a message.
Iran’s Supreme National Security Council said it would reciprocate any violation by the "untrustworthy" American side, promising to show "no leniency" until Iran’s full rights were secured.
The memorandum sets a 60-day window for negotiators to resolve the status of Iran’s nuclear programme unless they agree to an extension. As part of the package, negotiators established a $300 billion reconstruction fund for Iran along with other financial incentives. U.S. officials said Washington would also press to limit Iran’s long-range missile capabilities.
When the conflict began nearly four months ago, President Trump articulated aims that included destroying Iran’s pathways to develop nuclear weapons, ending Tehran’s ability to strike neighbouring states, impeding its support for allied anti-Israel militants, and creating conditions for internal change in Iran. None of those objectives had been fully realised by the time the memorandum was signed.
Under the terms included in the agreement, Iran reiterated its long-standing claim that it would not obtain nuclear weapons and agreed to onsite down-blending of its highly enriched uranium stockpile plus inspections by the International Atomic Energy Agency as a Non-Proliferation Treaty member. That outcome falls short of the administration’s aim, expressed by Mr. Trump, to remove the material from Iranian territory.
U.S. officials maintained that the technical negotiations could still produce a robust framework on nuclear limits, seeking to forge an outcome that officials described as an improvement over a previous agreement from 2015 that the Trump administration had withdrawn from during his first term. But sceptics say Iran has emerged politically and strategically strengthened after enduring a major military campaign, asserting control over maritime chokepoints and gaining exemptions from financial sanctions.
On maritime control, Iran has said it will exercise authority over the Strait of Hormuz in partnership with Oman and plans to charge ships service fees that did not exist before the conflict, though it said such fees would not be levied during the 60-day negotiation window.
Energy markets have responded to developments on the ground. Oil prices eased on Friday amid signs of a potential increase in supply as tankers began transiting a reopening Strait of Hormuz - a waterway that before the conflict had carried nearly one-fifth of global crude oil and liquefied natural gas flows.
At the same time, the military situation in Lebanon remains acute. The Lebanese state news agency reported that fresh Israeli strikes on Friday killed at least 18 people; Israel said the operations targeted Hezbollah. Those continued strikes complicated prospects for enforcing a "permanent termination" of the war in Lebanon, as stipulated by the memorandum, since Israel has indicated no intention of withdrawing and has instead presented an expanded occupation zone in a new map.
Mr. Trump has grown openly critical of Israel’s conduct in Lebanon, widening a rift between the two countries that officials described as among the deepest in decades.
Domestically, the financial burden of the conflict has also drawn scrutiny. U.S. defence officials told lawmakers they required roughly $80 billion to cover the war’s costs and other unrelated spending needs, a figure reported by a financial newspaper that tracks defence appropriations.
The near-term outlook for the U.S.-Iran talks remains uncertain following the Swiss announcement and Vance’s cancelled travel plans. Preparatory activity at Burgenstock continues, according to Swiss officials, but Tehran’s insistence on seeing U.S. implementation of the interim pact first and ongoing hostilities in Lebanon underscore the fragility of a path to a durable settlement.
With both on-the-ground military dynamics and political questions at play - domestically and internationally - negotiators face a compressed timetable to convert a tenuous ceasefire and interim memorandum into enforceable, long-term arrangements.