Iran's president said Wednesday that it will stop exporting excess uranium and heavy water from its nuclear programme as stipulated by the 2015 atomic accord and set a 60-day deadline for new terms to the deal before it will resume higher uranium enrichment.
Hassan Rouhani's address to the nation came on the anniversary of President Donald Trump's decision to withdraw America from the landmark agreement.
Rouhani said Iran wanted to negotiate new terms with remaining partners in the deal, but acknowledged that the situation was dire.
"We felt that the nuclear deal needs a surgery and the painkiller pills of the last year have been ineffective," Rouhani said.
"This surgery is for saving the deal, not destroying it."
"After a year of patience, Iran stops measures that (the) US has made impossible to continue," he wrote on Twitter. World powers have "a narrowing window to reverse this."