Trump Declares Iran Ceasefire on Life Support After Tehran Rejects Nuclear Terms

President Donald Trump declared on May 12 that the U.S.-Iran ceasefire is "on massive life support" after Tehran submitted a counterproposal that Washington rejected as fundamentally incompatible with its core demands, particularly on Iran's nuclear program. Trump said the ceasefire was in critical condition after Tehran's latest offer did not include nuclear concessions. Despite the sharp language, Trump did not foreclose diplomacy, telling reporters a negotiated resolution remains possible. U.S. Ambassador to the United Nations Mike Waltz told ABC that the administration is giving diplomacy "every chance we possibly can before going back to hostilities."

The negotiations operate within a conflict that began Feb. 28, 2026, when the United States and Israel launched coordinated military strikes against Iran. On April 8, the United States and Iran agreed to a two-week ceasefire mediated by Pakistan. The war formally paused under that ceasefire framework, though negotiations over a broader settlement have remained unresolved. Iran responded to the military campaign by restricting traffic through the Strait of Hormuz. Iran has largely blocked the strategic waterway since the war began, and the U.S. military in turn has blockaded Iranian ports since April 13, reporting that it has turned back 61 commercial vessels and disabled four. In peacetime, roughly one-fifth of the world's oil and liquefied natural gas supplies transit the narrow passage linking Gulf oil producers to the open ocean.

The immediate trigger for Trump's remarks was Iran's response, delivered Sunday, to the latest American proposal. Washington's proposal addressed ending the war, reopening the Strait of Hormuz, and rolling back Iran's nuclear program. Tehran rejected those terms outright. Iranian state television reported that Tehran rejected the proposal as amounting to "surrender," insisting instead on war reparations by the U.S., full Iranian sovereignty over the Strait of Hormuz, an end to sanctions, and the release of seized Iranian assets. Iran's counterproposal also called on the U.S. to end its naval blockade, guarantee no further attacks, and end a U.S. ban on Iranian oil sales. Trump posted on Truth Social that the Iranian response was "TOTALLY UNACCEPTABLE" before making his "life support" remarks to reporters the following day. [POLITICO] The administration announced new sanctions against Iran and Trump said he would meet with his top military commanders to discuss next steps.

The nuclear file is the central fault line. The Iranians are seeking to separate nuclear talks from negotiations to reopen the Strait of Hormuz, while the Trump administration is demanding nuclear commitments up front. Iranian Foreign Ministry spokesman Esmail Baghaei, speaking to press Monday, explicitly deferred the issue. Baghaei said Iran was not currently focused on decisions related to uranium enrichment or the future of its nuclear activities, stating "our focus is on ending the war," and that nuclear matters "will be discussed when the time comes." The IAEA reports that the scale of the uranium challenge is not trivial. Iran's stockpile of highly enriched uranium is a major sticking point, with the U.N. nuclear agency reporting Iran holds more than 440 kilograms enriched to 60% purity, a short technical step from weapons grade. The majority of that material is likely held at Iran's Isfahan nuclear complex, according to the IAEA director-general.

The U.S. position on nuclear enrichment has been consistent throughout the negotiating cycle. The U.S. position in 2025 and 2026 has been that Iran must conduct zero enrichment, a demand Iran has rejected on multiple occasions. Earlier U.S. proposals, transmitted via Pakistani intermediaries, called for dismantlement of the uranium enrichment program, zero enrichment going forward, suspension of ballistic missile activities, and reopening of the Strait of Hormuz. Iran has also resisted transferring its enriched uranium stockpile abroad. Russian President Vladimir Putin said Saturday that Moscow's proposal to take enriched uranium from Iran to help facilitate a settlement remains on the table. The Wall Street Journal reported that Iran did not agree to U.S. demands regarding its nuclear program, and that Tehran called for separate nuclear negotiations and for some of its highly enriched uranium to be diluted with the rest sent to a third country.

The military option remains on the table. Energy Secretary Chris Wright alluded to restarting military operations over the weekend, stating that "if it's clear in the next few days that there's not a good path to a negotiated settlement, we will go back to the military method to open the strait." Trump has also reiterated threats to resume full-scale bombing if Iran does not accept an agreement to reopen the strait and roll back its nuclear program. The procedural and diplomatic path forward remains unsettled. Talks have been channeled through Pakistan as a primary mediator, and both China and Qatar have played supporting roles. Beijing hosted Iranian Foreign Minister Abbas Araghchi last week, with Chinese top diplomat Wang Yi reaffirming the "strategic partnership" between the two countries while urging Tehran to pursue a diplomatic resolution. A Qatari natural gas tanker crossed the Strait of Hormuz on Sunday for the first time since the war began, heading for Pakistan, as Washington continued to await Tehran's formal response to its latest proposals. The symbolic passage provided scant relief to markets or to negotiators attempting to bridge a gap that now spans maritime sovereignty, frozen assets, war reparations, and the full architecture of Iran's nuclear program.