By The South Asia Times

Geneva – High-stakes negotiations between the United States and Iran scheduled for Friday at the Swiss resort of Bürgenstock have been canceled due to Israeli ceasefire violations in Lebanon, according to sources.

The Swiss Foreign Ministry confirmed the abrupt cancellation early Friday, stating simply that "the discussion at Bürgenstock will not take place as planned today" and that the talks have been "postponed."

Switzerland, which has served as a facilitator, said it "remains ready to facilitate these talks" and that preparations at the venue were continuing, though no new date has been announced.

The announcement came shortly after the White House revealed that US Vice President JD Vance would not be departing for Switzerland as expected, citing unresolved logistical details for the planned technical talks.

"As the Vice President said at his press conference, the plans for the upcoming technical talks have not been finalized," a White House spokesperson said, adding that the US delegation was "prepared to depart at the first available opportunity".

Diplomatic sources have pointed to escalating tensions in Lebanon as the primary catalyst for the postponement. Israeli airstrikes overnight reportedly killed at least 16 people in southern Lebanon, while Hezbollah confirmed fierce ground fighting was ongoing.

Israeli Prime Minister Benjamin Netanyahu has maintained a hardline stance, declaring that Israeli forces would continue their presence in southern Lebanon's "safe zone" as long as "Israel's security needs demand it".

This directly contradicts the spirit of the Islamabad Memorandum, which explicitly called for an "immediate and permanent cessation of hostilities on all fronts, including Lebanon".

According to a US official cited by Axios reporter Barak Ravid, Iran has made its position clear: any new Israeli attack on Lebanon would be considered a violation of the memorandum with the United States.

Iranian Supreme Leader Mojtaba Khamenei reportedly warned that Tehran would not accept "excessive demands" from Washington, despite being persuaded by President Pezeshkian to engage in the diplomatic process.

The canceled talks were intended to implement the historic "Islamabad Memorandum of Understanding," a 14-point agreement brokered by Pakistan and signed electronically on Wednesday by US President Donald Trump and Iranian President Masoud Pezeshkian.

Pakistani Prime Minister Shehbaz Sharif, who signed the document as mediator alongside his Chief of Army Staff Field Marshal Syed Asim Munir, hailed the agreement as a landmark diplomatic achievement.

Under its terms, Iran agreed to immediately reopen the strategically vital Strait of Hormuz—through which approximately 20% of the world's oil supply passes—while the US committed to lifting its naval blockade.

The memorandum also established a 60-day window for resolving outstanding issues, including Iran's nuclear program, the complete lifting of sanctions, and a $300 billion reconstruction fund for Iran . 

Speaking at a White House briefing before the cancellation, Vance had touted the economic benefits already flowing from the deal, claiming more than 12.5 million barrels of oil had passed through the Strait of Hormuz since the signing, leading to lower oil prices and falling fuel costs in the United States.

The Vice President also pushed back against criticism that the deal amounted to a US financial handout to Tehran. "The only way the Iranians get any of those resources—not a single penny, by the way, from the United States of America under any circumstances—is if they comply fully and change their behavior," Vance insisted.

The regional war, which began on February 28 when the US and Israel launched a military offensive against Iran, has claimed at least 7,000 lives and sent global energy prices soaring. While the initial ceasefire in April—brokered by Pakistan—had halted direct conflict, the ongoing violence in Lebanon has now emerged as the deal's most vulnerable flank.