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Trump's Threat to Invade Iran Derails Swiss Peace Talks, Iranian Delegation Walks Out

Trump's Threat to Invade Iran Derails Swiss Peace Talks, Iranian Delegation Walks Out
Security · 2026
Photo · Huang Wei for Asian Examiner
By Huang Wei Security & Defense Jun 22, 2026 4 min read

Peace negotiations between the United States and Iran, held at a mountain resort in Switzerland, have been thrown into disarray after US President Donald Trump issued a series of escalating threats against the Iranian delegation. According to multiple reports, Trump threatened to assassinate negotiators and said Iran would no longer exist as a country if it closed the Strait of Hormuz. The Iranian delegation subsequently walked out, filing a complaint with mediators from Pakistan and Qatar, and demanded a formal apology from Trump.

Trump's Threats Escalate as Talks Collapse

Trump's outburst on Sunday followed Iran's announcement that it was closing the Strait of Hormuz again after Israel intensified its assault on Lebanon. In a phone call with Fox News correspondent Trey Yingst, Trump told Iranian negotiators that if they shut the strait, they would not even make it back to their country, a threat widely interpreted as an assassination warning. This broke the first clause of the memorandum of understanding (MOU) that had been signed earlier, which prohibited such threats.

Iran's chief negotiator, Mohammad Bagher Ghalibaf, dismissed the threats, stating that his team does not take American threats seriously. "Don't they think that if their threats had worked, they wouldn't have ended up in today's desperate situation?" Ghalibaf said. He warned that Iran's armed forces are ready to respond in a different way, adding, "No matter what they say, we are the ones who act."

Iran's Red Lines and the Lebanon Factor

The Iranian delegation has made clear that an end to Israel's occupation of southern Lebanon, which has killed more than 4,000 people and displaced over 1.2 million civilians, is a red line for any peace deal. According to the Lebanese outlet Al Mayadeen, the delegation said it will not return to the talks until Trump apologizes and Israel fully withdraws from Lebanon. Meanwhile, senior Israeli officials cited by Channel 12 have indicated that Israel is considering limited withdrawals from areas within its so-called buffer zone, but the US has not requested a full withdrawal.

Trump's threats come despite his earlier acknowledgment of Iran's right to enrich uranium and maintain a nuclear energy program, a shift that had raised hopes for a diplomatic resolution. However, his latest outburst was reportedly triggered by a statement from Iranian President Masoud Pezeshkian, who said the US would be forced to accept Iran's right to enrichment. Trump responded by telling Pezeshkian to "watch his mouth" and threatening to "take over the rest of the country."

Mixed Signals from Washington

The contradiction in Trump's approach has not gone unnoticed. While he has privately acknowledged that Israeli Prime Minister Benjamin Netanyahu is using the Lebanon conflict to sabotage the ceasefire and drag the US into a full-scale war, he has taken no concrete action to force Israel to comply with the MOU's terms. In his call with Yingst, Trump expressed disappointment that Israel cannot defeat Hezbollah without destroying buildings, and even suggested allowing Syrian President Ahmed al-Sharaa—the former leader of al-Qaeda's Syrian affiliate—to take over operations against Hezbollah.

Jeet Heer, a writer at The Nation, remarked that the mixed messages from the White House are making it much harder to end the war and could spark further conflict. Trita Parsi, executive vice president at the Quincy Institute for Responsible Statecraft, has also warned that Trump's threats undermine any credibility the US might have in negotiations.

Implications for Asia and the Indo-Pacific

The collapse of the Swiss talks has significant implications for Asian energy security and regional stability. The Strait of Hormuz is a critical chokepoint for oil exports from the Persian Gulf to major Asian economies, including China, India, Japan, and South Korea. Any disruption to shipping through the strait could send shockwaves through global energy markets, hitting Asian importers particularly hard. The MOU that Trump had signed was seen as a potential framework for de-escalation, but his latest threats have effectively torpedoed that process.

Iran's closure of the strait, announced on Saturday, was in response to Israel's deepening occupation and bombing of southern Lebanon, despite the MOU's ceasefire agreement covering all fronts. The Iranian negotiators have described an end to Israel's Lebanon occupation as a red line, and they are unlikely to return to the table without significant concessions from both the US and Israel.

As the situation stands, the peace process is in limbo. Trump's threats have not only derailed the talks but also raised the specter of a wider conflict that could draw in multiple regional powers. For Asian nations that rely on stable energy supplies and regional security, the stakes could not be higher.

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