Iran's foreign ministry spokesperson said a four-way meeting between Iran, the United States, Pakistan and Qatar in Switzerland failed to reconvene after threatening statements by US officials, with subsequent contact conducted only through mediators, on a June 23 press conference.

The account adds Tehran's version to conflicting narratives over how the Switzerland round unfolded, after US Vice-President JD Vance said the Iranian delegation had not walked out following President Donald Trump's threats and that discussions had run until 1am. The talks form part of a 60-day push for a final deal after the war between the two countries.

Spokesperson Esmaeil Baghaei, who was present in Switzerland, said the four-way session, with Iran, the United States, and two mediators present, began at around 3pm and lasted about an hour and a half, with an agreement to resume after a short half-hour break.

"I have always promised you I would not tell you a narrative; I would tell you the truth," said Baghaei.

During that interval, Iran was confronted with significant and threatening statements by US officials, after which the four-way meeting did not reconvene, and the exchange continued through mediators, Baghaei said. Iran had no direct contact with the US side after the decision to halt the four-way format.

On a separate mechanism agreed for Lebanon, Baghaei said Iran had seen continued Israeli attacks on the country since the ceasefire understanding of Farvardin 19, corresponding to April 8.

A commitment to halt the war in Lebanon was an integral part of both the April ceasefire and the war-ending memorandum dated Khordad 28, corresponding to June 18.

Baghaei said the mechanism would involve the United States, Iran, mediators and the Lebanese government, and would oversee implementation of the memorandum's first clause on halting the war in Lebanon while seeking to prevent military clashes, though details required further work.

The official also said the United States has issued the licence needed to sell Iranian oil, petrochemical products and oil derivatives, along with the related insurance, transport and banking services, Entekhab reported.

The licence is the first concrete step in unwinding sanctions under a memorandum of understanding reached this month, a process Tehran says commits Washington to lifting all primary, secondary and international measures against Iran across a 60-day window. The framework follows the US-Iran war and a fragile ceasefire.

The spokesperson said the authorisation issued the previous day covered the sale of Iranian oil, petrochemicals and oil derivatives together with all associated requirements, meaning insurance, transport and banking matters must also be facilitated within its scope.

On the US side, Vice-President JD Vance said the lengthy talks had created a good foundation for a final deal, telling reporters after meeting Ghalibaf that negotiators had laid the groundwork but had yet to build on it, Associated Press reported.

He said technical negotiations would continue in Switzerland through the week.

Vance said the US agrees to unfreeze Iranian assets to fund purchases of American soy, corn and wheat, an idea he attributed to lead negotiator Jared Kushner and Qatari officials, with Qatar holding approval over the process. Iran, which has pressed for the release of billions of dollars in frozen assets, has not addressed the proposal.

Mediators Qatar and Pakistan said the United States and Iran had agreed on a road map towards a final deal within 60 days after what they described as encouraging progress, following the signing of a 14-point memorandum of understanding on June 17. The breakthrough came after an 18-hour meeting at Lake Lucerne.

The disruption to the talks followed remarks by President Donald Trump in a Fox News interview, in which he threatened Iran over the Strait of Hormuz and said its officials would not make it back to their country without a deal, CNN reported. Ghalibaf denounced the comments as a sign of desperation in Washington.