“Iran’s enrichment of uranium to 20% at Fordow is a clear attempt to intensify the nuclear blackmail campaign.

These attempts will continue to fail, "RIA Novosti quoted him as saying.

The State Department stressed that they are counting on the work of IAEA inspectors who will report on the facts of enrichment in the field.

“We are confident that the IAEA will monitor and report any new nuclear activities in Iran,” said a State Department official.

Earlier, Iranian government spokesman Ali Rabia said that Tehran had launched the process of uranium enrichment to 20% at the nuclear facility in Fordow.