Abbas Araghchi said the first round of talks in Oman on Friday had been a "good start".

He added that nuclear "enrichment is our inalienable right and must continue. Even with bombing they could not destroy our capabilities", according to excerpts of an interview with the Al Jazeera network, published in Persian on his official Telegram channel.

"We are ready to reach a reassuring agreement on enrichment," he added during the interview, which was later released in parts by Al Jazeera with Arabic dubbing.

He said, however, that "Iran's sovereign position is opposition to transferring uranium abroad".

"The Iranian nuclear case will only be resolved through negotiations," he added.

Araghchi's remarks came a day after renewed nuclear talks in Muscat with Washington, which has deployed an aircraft carrier group to the Middle East following Iran's deadly response to anti-government protests.

Friday's negotiations were the first since nuclear negotiations between Iran and the United States collapsed last year following Israel's unprecedented bombing campaign against Iran, which triggered a 12-day war.

During the war US warplanes bombed Iranian nuclear sites.

Araghchi called Friday's talks "a good start", but insisted that "there is a long way to go to build trust".

He warned that Iran "will attack their (US) bases in the region" if Washington targets Iranian territory.

He said the discussions in Muscat were "indirect", via Omani mediation, but said that there was "an opportunity" for a handshake with the US delegation.

The two sides had agreed to hold another round of talks "soon", but the date has yet to be determined, Araghchi said.

"Changing the location of negotiations with Washington in the second round is possible," he added.

He said Iran's missile programme was "never negotiable" because it relates to a "defence issue".

The United States has sought to address Iran's ballistic missile programme and its support for militant groups in the region -- issues which Israel has pushed to include in the talks, according to media reports.

Tehran has repeatedly rejected expanding the scope of the negotiations beyond the nuclear issue.