Why Iran’s Delay on the U.S. Peace Proposal Raised Gulf Tensions

The narrower and better-supported conclusion is this: Iran was resisting the proposal as written, delaying a definitive answer, and trying to change the terms of the negotiation rather than formally closing the diplomatic channel ^[4][10][11].

The dispute was about sequencing and leverage

The fight was not only about whether diplomacy should continue. It was also about what should happen first.

On the U.S. side, Secretary of State Marco Rubio said Washington was awaiting a “serious offer” from Iran on Friday, and the latest offer was described as calling for an end to the war before talks on urgent issues, including the fate of Iran’s nuclear programme ^[9].

Iran’s reported counterproposal had its own phased logic. The Institute for the Study of War reported that Tehran’s counterproposal included a three-phase plan that would seek to end the war quickly, guarantee no future combined-force strikes on Iran, and address the Strait of Hormuz in the first phase, while pushing talks on Iran’s nuclear program into a second phase ^[10]. ISW assessed that Iran appeared to be offering possible nuclear discussions later in order to push the United States to end the war and lift its naval blockade ^[10].

That sequencing mattered because it affected leverage. If the war, security guarantees and Hormuz issues were handled first, Iran would have secured major immediate objectives before the hardest nuclear questions came to the table ^[10].

Why the delay raised tensions

The delay was especially dangerous because it happened during a military and maritime standoff, not during a calm diplomatic pause. Reporting on May 9 described renewed naval clashes, airstrikes, drone attacks, and Britain sending a destroyer toward the Strait of Hormuz while Washington awaited Tehran’s answer ^[4]. Separately, the U.S. request for a serious Iranian offer came amid sporadic clashes in the Persian Gulf ^[9].

The Strait of Hormuz was a central flashpoint. Reporting linked the sporadic clashes to tensions over the U.S. Navy blockade of the strait, which Iran had repeatedly called a ceasefire violation ^[9]. Iran’s reported counterproposal also placed Hormuz in the first phase of a deal, showing that maritime access was not a side issue but part of the core early bargain Tehran wanted ^[10].

In that setting, a delayed answer did more than slow negotiations. It prolonged uncertainty over the same issues driving the standoff: the war, the blockade, Hormuz, security guarantees and the future of nuclear talks ^[9][10].

What Tehran’s posture signaled

Iran’s position can be read as a form of conditional pushback. The available sources support four points:

• Tehran did not provide the clear, timely answer Washington said it was waiting for ^[4][9].
• Iranian officials criticized U.S. terms as unrealistic or shifting, while saying Iran remained engaged ^[11].
• Iran appeared to prefer a phased plan that handled the war, Hormuz and security guarantees before nuclear-program talks ^[10].
• The delay came as clashes and naval pressure in the Gulf made the diplomatic window more fragile ^[4][9].

Bottom line

Iran’s delayed response was best understood as delay plus bargaining, not a proven final rejection. Tehran criticized Washington’s terms, questioned U.S. seriousness and appeared to push for a phased deal that would address the war, security guarantees and the Strait of Hormuz before the hardest nuclear questions ^[4][10][11].

That raised tensions because Washington was publicly waiting for a serious Iranian offer at the same time that clashes, naval deployments and the Hormuz blockade dispute were keeping the Gulf standoff active ^[4][9].