US President Joe Biden's administration said it was ready to return the US to the accord. "There's a lot of work to be done," but "I don't expect an immediate solution," Guterres said during a press conference when asked about the possibility of mediating a way out of the impasse.
"I believe that everyone, all those who entered the Joint Comprehensive Plan of Action (JCPOA) and other interested parties must work together to reduce uncertainties, to face difficulties and obstacles," he said.
The deal, meant to prevent Tehran from acquiring nuclear weapons, was agreed between Iran, the United States, China, Russia, Britain, France and Germany in 2015.
In response to the US leaving the deal and imposing sanctions, Iran reneged on several of its nuclear commitments, though it insisted the measures were reversible.
