The negotiations stopped after Iran’s presidential election in June, won by an ultraconservative, Ebrahim Raisi, after his most potent opponents, including more moderate contenders, were barred from running. He replaced the president who had negotiated the 2015 deal with the United States and European powers.
Negotiated by the Obama administration, the agreement called for Iran to limit its enrichment of uranium for 15 years, to prevent it from developing a nuclear weapon, in exchange for the lifting of crippling economic sanctions. President Donald J. Trump reimposed sanctions in 2018 in hopes that choking Iran’s economy again would force it to negotiate more restrictive terms.
Iran’s previous president, Hassan Rouhani, had been elected amid hopes that a deal could open up Iran’s economy, offering new opportunities and better lives for a population that has lived under some form of Western sanctions for decades. But after Mr. Trump reneged on the deal, Mr. Rouhani’s approach was widely discredited, even among moderate Iranians who had supported accommodation with the West.
When the Biden administration tried to restart talks this year, prospects for a new deal were already in doubt. Iran had already enriched uranium far beyond the limits set in 2015, and experts said it had made irreversible advances in nuclear technology.
In addition, the new government has an acute distrust of the United States and its European partners, and Iranian officials have questioned whether their American counterparts can be trusted not to back out of any new deal, as they did with the original.