High-level U.S.-Iran talks on an interim deal to end the war start tense in Switzerland as President Donald Trump renews threats from abroad. Vice President JD Vance meets Iranian officials at a Bürgenstock venue alongside mediators Pakistan and Qatar to keep negotiations moving on difficult issues including Iran’s nuclear program, the Strait of Hormuz, and steps such as unfreezing billions of dollars in Iranian assets. Iran signals that it wants to focus first on Lebanon, where Israel’s military is fighting the Iran-backed Hezbollah group, and the U.S. and Iran dispute related actions and statements. Trump publicly warns Iran to rein in Hezbollah-related activity in Lebanon, and says the U.S. would “hit Iran very hard again” if it does not comply, while also issuing broader warnings about Iran’s behavior regarding the Strait of Hormuz. Separately, Iran announces it has again closed the Strait of Hormuz, tying the move to ongoing Israeli strikes in southern Lebanon. Reports also note Israel is not withdrawing from a security zone in southern Lebanon, adding further complications for negotiations. Despite the heightened rhetoric and shifting conditions, negotiators are described as pressing ahead, including work extending through the night.