Iran delegation walks out of US talks in Switzerland after Trump threat

The diplomatic atmosphere in Switzerland deteriorated rapidly on Sunday after President Donald Trump posted a direct warning to Tehran on Truth Social. Trump demanded that Iran immediately halt the activities of its "highly paid proxies" in Lebanon—referring to Hezbollah—or face military strikes even more severe than those conducted by the U.S. last week. Following the post, Iranian state-linked agencies Tasnim and Fars reported that the Iranian delegation abandoned the negotiation room in protest, effectively ending the day's discussions prematurely.

Strategic Chokepoint Remains Closed

Compounding the diplomatic crisis, an Iranian military source informed Fars News that the IRGC Navy has not issued any permits for vessel passage through the Strait of Hormuz. The waterway, a critical artery for global energy supplies, remains blocked "until further notice." This maritime pressure coincides with statements from Mohammad Bagher Ghalibaf, Speaker of Iran's Majlis, who dismissed American threats as a sign of "desperation" and asserted that Iran's armed forces are prepared to respond to any escalation.

Analysis and Regional Stakes

The walkout represents a significant setback for the proposed Memorandum of Understanding between Washington and Tehran. While Qatari and Pakistani mediators have reportedly sought a "conciliatory" gesture from the U.S. administration to salvage the talks, the gap between the parties remains wide. Israel, meanwhile, has maintained firm conditions for any regional arrangement, including the total withdrawal of Hezbollah forces north of the Litani River and full freedom of military action to eliminate emerging threats. The current impasse suggests that Tehran is attempting to link the diplomatic track directly to the survival of its regional proxy infrastructure, a position that clashes with the "security-first" posture currently signaled by the Trump administration.