Vice President JD Vance said Thursday that the U.S. and Iran were "very close" to a memorandum of understanding (MOU) that would extend the ceasefire by 60 days, reopen the Strait of Hormuz, and launch talks on limiting Tehran's nuclear program. Why it matters: The signing of the MOU would be the most significant diplomatic breakthrough since the war started, but a final agreement tackling President Trump 's nuclear demands would require further intensive negotiations. Trump and his advisers thought they were close to a deal several times at earlier stages in the war, but talks repeatedly stalled. Driving the news: U.S. and Iranian negotiators have reached an agreement on a 60-day MOU, but Trump has yet to give his final approval, Axios reported earlier Thursday. U.S. officials claimed their Iranian counterparts told them through mediators that they had the necessary approvals and were prepared to sign. An official from one of the mediating countries confirmed this.…