Washington DC: US Secretary of State Mike Pompeo on Sunday threatened Iran with "further isolation and sanctions" hours after Tehran announced that it will "in a few hours" begin enriching uranium beyond the limit set in its 2015 nuclear deal with world powers.

"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.