What leverage did Iran misjudge in negotiations?

Iran’s leverage miscalculation

A U.S. official said the U.S.-Iran peace talks fell apart after Tehran misjudged the leverage it believed it had. In other words, Iran’s negotiating posture was based on an incorrect assessment of how much pressure or bargaining power it could bring to the table.

The key detail provided in the reporting is not a specific bargaining concession or a named proposal, but the broad characterization: Tehran “severely misjudged what kind of leverage the regime believed it held.” The official linked this misreading to the collapse of the talks.

How that connects to the talks ending

The failure occurred after the negotiations ended without an agreement following roughly 21 hours of face-to-face discussions in Islamabad. Vice President JD Vance said the U.S. left negotiations after Iranian officials did not accept American terms.

Because the reporting describes the collapse as an “over leverage” problem rather than a negotiation-by-negotiation breakdown, it implies the parties were far apart on what each side considered enforceable or realistic.

Why it matters

Leverage assumptions are decisive in high-stakes diplomacy: if one side believes it can force concessions, it may set non-negotiable demands; if the other side sees that leverage as overstated, it may hold firm. That dynamic increases the chance of talks ending without agreement.

In this case, the immediate consequence was a shift toward military pressure after diplomacy did not deliver a deal. After the negotiations failed, Trump announced that the U.S. Navy would begin steps associated with a blockade/interdiction posture in the Strait of Hormuz—an outcome that underscores how quickly diplomacy moved toward coercive measures when talks ended.

As a result, the leverage miscalculation framing helps explain both why talks collapsed and why escalation risk rose quickly afterward.