US and Iran Negotiators Reach Tentative MOU — 60-Day Ceasefire Extension and Nuclear Talks Framework

US and Iranian negotiators reached a tentative Memorandum of Understanding (MOU) on May 28, 2026, with officials on both sides confirming agreement on a framework to extend the ceasefire by 60 days and establish a structure for nuclear talks — though the deal still required approval from both President Trump and Supreme Leader Mojtaba Khamenei. The MOU's core elements included: (1) a commitment from Tehran not to pursue a nuclear weapon; (2) a 60-day negotiation window on Iran's nuclear program, including the fate of its 440.9 kg stockpile of 60%-enriched uranium; (3) Iran transferring highly enriched uranium to a third country; (4) Iran restoring IAEA inspections and implementing the Additional Protocol; (5) the US committing to discuss sanctions relief and the release of frozen Iranian assets; and (6) language reopening the Strait of Hormuz to unrestricted navigation, including lifting the US blockade of Iranian ports. Senior Vance told CNN there were still 'a couple of issues on the nuclear stuff' — specifically the fate of the highly enriched uranium stockpile and the question of ongoing enrichment rights. A senior Iranian official told Reuters that while 'a political understanding has been reached, it has not yet been finalized.' Iran's foreign ministry cautioned that 'no final agreement' existed. The MOU represented the most concrete progress in the three-month conflict, though the gap on enrichment rights and frozen assets release remained the final obstacles.