A secret Oman channel and the first presidential phone call since 1979 led to the 2015 nuclear deal, which pushed Iran's breakout time from weeks to about a year. In 2018, with inspectors certifying compliance, Trump withdrew and launched maximum pressure. Iran rebuilt its stockpile, tensions rose, and the 2020 killing of Qasem Soleimani brought the two states to the brink.
2013Obama and Rouhani speak by phone, the first direct presidential contact since 1979.
July 2015The JCPOA is signed: enriched uranium shipped out, centrifuges slashed, inspections expanded.
May 2018Trump withdraws from the deal and launches "maximum pressure."
2019Tanker incidents and a downed U.S. drone raise tensions.
January 3, 2020A U.S. drone strike in Baghdad kills Soleimani; Iran fires missiles at U.S. bases in Iraq.
Still debated
Whether the deal was working and whether leaving it was justified remains a live policy debate. Inspectors certified Iranian compliance in 2018, while critics faulted its sunset clauses, missiles and regional behavior.