U.S., Iran talks stall as Israel-Hezbollah ceasefire remains fragile

Hezbollah’s refusal to accept a ceasefire plan, even as Israeli strikes continued in southern Lebanon and near Tyre, showed how quickly proxy warfare can block diplomacy between Washington and Tehran. The fighting kept pressure on both sides just as the United States was pressing for a broader deal to calm the region and reduce the risk of a wider war.

Iran had not yet sent a response to a proposed final agreement with the United States as of June 2, and Abbas Araghchi said on June 4 that there had been “no tangible progress” in the talks. He warned that any Israeli attack on Beirut in the campaign against Hezbollah could trigger a “full-scale resumption” of the conflict, a sign that Tehran was tying its negotiating room to what happened in Lebanon as much as to the nuclear and security issues at the center of the U.S. talks. Donald Trump, by contrast, said negotiations were moving continuously and at a rapid pace.

The diplomacy around Lebanon fractured almost immediately. Israel and Lebanon announced on June 3 that they would implement a ceasefire after U.S.-mediated talks in Washington, but Hezbollah rejected the terms on June 4, calling them a form of surrender because they required the group to stop firing and pull fighters back from southern Lebanon. Joseph Aoun called the arrangement the “last chance” for a comprehensive truce, underscoring how little political space remained for another collapse.

The broader setting made the stakes even higher. More than three months after U.S. and Israeli strikes against Iran, the confrontation had settled into a stalemate with a shaky ceasefire, while the Strait of Hormuz remained largely shut to maritime traffic. That left any U.S.-Iran agreement dependent on whether the Lebanon front could be quieted first. For such a deal to hold politically, Hezbollah would have to stop firing and move its fighters out of southern Lebanon, Israel would have to stop strikes on Beirut and along the south, and the fragile ceasefire would have to survive long enough for Washington and Tehran to claim that escalation had been contained rather than merely postponed.