The Biden administration has been seeking to engage Iran in talks about both sides resuming compliance with the deal, under which U.S. and other economic sanctions on Tehran were removed in return for curbs on Iran’s nuclear program to make it harder to develop a nuclear weapon — an ambition Tehran denies.
The odds of their making progress to revive the deal before Iran holds a presidential election in June have dwindled after Tehran opted to take a tougher stance before returning to talks.
Writing in Foreign Affairs magazine last year when he was a presidential candidate, Biden said: “Tehran must return to strict compliance with the deal. If it does so, I would rejoin the agreement.”