"Iran’s latest expansion of its nuclear program will lead to further isolation and sanctions. Nations should restore the longstanding standard of no enrichment for Iran’s nuclear program. Iran’s regime, armed with nuclear weapons, would pose an even greater danger to the world," he tweeted.

Iran said this week it was about to break the limit on uranium enrichment above 3.67 percent set in the Joint Comprehensive Plan of Action (JCPOA).

Tehran has repeatedly demanded that the European signatories to the deal shield it from US sanctions. Washington quit the deal last year, which waived sanctions on Tehran in return for curbs on its nuclear program.