US-Iran talks set for Sunday in Switzerland as Lebanon fighting continues

US and Iranian negotiators will meet in Bürgenstock, Switzerland, on Sunday for technical-level talks that are now carrying the weight of a wider regional crisis. Pakistan and Qatar will serve as intermediaries, but the battlefield pressure from Lebanon is likely to shape how far the diplomacy can go.

Pakistan’s Foreign Ministry said the talks will bring together delegations from the United States and Iran, with mediators from Pakistan and Qatar participating alongside them. The meeting is being cast as a follow-up to an earlier memorandum of understanding signed in Islamabad, and it is meant to test whether that understanding can be turned into something more durable.

The agenda is expected to be narrow but consequential: implementation of the deal, nuclear-program issues, sanctions relief, and broader regional security. That is a substantial list for technical-level talks, and it underscores how quickly the discussions have moved beyond procedure into questions that touch the core of US-Iran rivalry.

The timing is fragile. Israeli strikes in southern Lebanon killed at least 16 people on June 20, adding fresh urgency to a conflict that has already threatened the diplomacy. The escalation in Lebanon has been described as a major obstacle to turning the interim understanding into a lasting Middle East arrangement, with the violence now running parallel to the Swiss talks rather than easing before them.

Iran also said the Strait of Hormuz was closed again, linking the move to Israeli attacks in Lebanon. US officials said traffic was still moving through the waterway, a sign that the immediate shock may be more political than physical for now. Even so, the strait remains one of the world’s most sensitive energy corridors, and any hint of disruption raises the stakes far beyond the region.

The negotiations are also being shaped by the movement of senior American figures. JD Vance said Steve Witkoff and Jared Kushner were already in Switzerland for the talks, and said he expected to reschedule his own trip within days. That suggests the White House is treating the meeting as a live test of whether the broader understanding can survive the Lebanon crisis, or whether violence will once again outrun diplomacy.