JD Vance cancelled his trip to Switzerland on Friday. The talks planned for Bürgenstock, designed to begin the 60-day nuclear negotiations mandated by the Islamabad Memorandum, were postponed without a new date. In southern Lebanon, Israeli forces struck Qennarit as a ceasefire was due to take effect, and by the end of that day 47 people were dead — not in Iran, not in any theatre the memorandum Trump had signed at Versailles four days earlier was designed to govern, but in Lebanon, the country whose inclusion in that document has become the question on which everything else turns.

The sequence has a quality that goes beyond the tactical. The American vice president cancels a flight. The first formal mechanism for implementing the deal suspends itself. Israeli aircraft operate in southern Lebanon at the exact hour a ceasefire was supposed to begin. The administration that brokered the memorandum issues no statement holding Israel to account, because the memorandum that mentions Lebanon was signed by parties who have no power to compel Israeli compliance, and those who do have that power signed a document that does not name them.

The Islamabad Memorandum's opening clause calls for an immediate and permanent end to military operations on all fronts, explicitly including Lebanon. Israel did not sign it and was not present in Islamabad. The party whose military conduct in Lebanon will determine whether the ceasefire survives was not asked to make any commitment. This is the foundational problem with the architecture of the agreement, visible before the ink dried. The memorandum's problems do not come from unexpected complications or bad faith on Iran's part. It was designed with a missing signatory, and the missing signatory is the one whose behaviour the agreement most needs to constrain.

According to a senior Middle Eastern official who spoke to CBS News, Israeli officials regarded the Lebanon clause not as a diplomatic achievement but as an American concession to Iranian demands — one made by Trump's own envoys while bypassing Secretary of State Marco Rubio, who had argued for months that keeping the Iran nuclear question and the Israel-Hezbollah conflict in separate diplomatic tracks was the only way to prevent Israel from acquiring an effective veto over any US-Iran agreement. Rubio was overruled. The envoys included Lebanon in the memorandum's opening clause because Iran would not sign without it. Iran got what it demanded in the text. Israel got to continue operating in Lebanon without having been asked to stop. The document committed the United States to a Lebanon ceasefire the United States does not control.

Iranian Foreign Minister Abbas Araghchi has left no interpretive room. The war ends in Lebanon too, he has stated, and any attack on Beirut will be treated by Tehran as a complete breach of the truce. Iran did not insert this condition as a late demand or a tactical manoeuvre. It is embedded in the first clause of the memorandum itself, the clause that defines what a ceasefire means. Iran signed a document that defines ceasefire as including Lebanon. Every Israeli strike in Lebanese territory is therefore, from Tehran's perspective, a ceasefire violation. On June 20, Iran made that argument concrete: it closed the Strait of Hormuz again, citing Israeli strikes in Lebanon as a direct breach of the deal. The United States denied the closure was taking effect. The architecture that produced that dispute is the memorandum's first clause.

What makes this a structural problem rather than a political one is that Iran cannot relent on Lebanon without undermining the entire logic of its position. Tehran entered the memorandum on the basis that Lebanon was included. To accept Israeli strikes while continuing to negotiate on nuclear terms would be to acknowledge that the memorandum's first clause means something different to Israel than it does to Iran, and to accept that discrepancy without consequence. This Tehran will not do. The logic is not merely political — it is written into the document that produced the 60-day clock now running.

Netanyahu and his government have stated explicitly that Israel does not consider itself bound by the Lebanon provisions of the memorandum. Netanyahu himself has been direct: Israel has goals to complete in Lebanon, and will pursue them through diplomacy if possible, through military operations if not. An intelligence assessment circulating in Washington found his calculations derive from a settled view of Hezbollah as an existential threat that cannot be deferred to accommodate American diplomatic timelines. Netanyahu has concluded, on the basis of considerable experience, that Washington will absorb the diplomatic cost of Israeli operations in Lebanon rather than impose the consequences that would actually change the calculation.

The pattern that supports that conclusion is documented. Israel bombed Beirut twice during the US-Iran negotiations, nearly derailing talks on each occasion. The ceasefire was announced. Strikes continued. Vance cancelled his flight. Talks were postponed. Each time, negotiations resumed. Each time, Washington reacted with concern and stopped short of consequences. Netanyahu's calculation that he can continue operating in Lebanon without breaking the American relationship is not irrational. It has been confirmed repeatedly by American conduct since February 28.

Vance told Time this week that Israel needs to 'wake up and smell the reality.' He noted that two-thirds of Israel's defence weapons are built and paid for by Americans. The implication was the clearest public acknowledgement by a senior American official that leverage exists and is not being used. Trump, asked directly whether he had spoken to Netanyahu about a Lebanon ceasefire, called it 'a little icing on the cake' and declined to confirm a direct conversation. These two responses, taken together, describe the American position precisely: the vice president names the leverage; the president minimises the commitment the vice president's government made in writing four days earlier; the bombing continues.

What this reveals is something more structural than a failure of nerve. The domestic political constraints that prevent meaningful American pressure on Israel now have a concrete consequence: they make it impossible for the United States to honour the first clause of an agreement it signed. Washington cannot discipline Israel on Lebanon. The memorandum's first clause depends on Washington disciplining Israel on Lebanon.

The talks that resumed in Bürgenstock ran for 80 minutes and did not address the nuclear programme. The first round of the 60-day technical negotiations that are supposed to close a gap neither side has moved since before the war — Iran's right to enrich uranium against Trump's demand for full surrender of enrichment — was consumed entirely by the question of Lebanon and MOU implementation. That is where the 60-day clock stands after its first week: the central question untouched, the opening clause contested, and Iran having already invoked Lebanese strikes as grounds to close the strait it was required to reopen.

If those operations continue — and there is no mechanism currently in place to stop them — Iran holds the legal and political justification to declare the ceasefire broken and leave the negotiations. Araghchi has said this publicly. The architecture of the memorandum makes it true: Lebanon is in the first clause, Israel is absent from the signatories, and the clock started when Trump signed at Versailles.

The question circulating in Washington, in Tehran and among the diplomats preparing for the next round is whether the Islamabad Memorandum can survive. The more precise question is whether the people who drafted its first clause believed it could. They knew Israel had not signed. They knew Iran's compliance depended on a Lebanon ceasefire that no signatory could enforce. They signed it anyway, at Versailles, with ceremony. Either they believed that American pressure on Israel would materialise in time, or they believed that signing any agreement was worth more than the agreement's capacity to hold. One of those beliefs will shortly be tested. The other already has been