Iran could agree to dilute its most highly enriched uranium in exchange for the lifting of all financial sanctions, its atomic chief said on Monday, one of the clearest indications so far of Tehran’s position in talks with Washington.

United States and Iranian diplomats held indirect talks through Omani mediators in Oman last week in an effort to revive diplomacy, after US President Donald Trump positioned a naval flotilla in the region, raising fears of renewed military action.

The talks followed a crackdown on anti-government demonstrations in Iran last month in which thousands of people were killed, the biggest domestic unrest since the 1979 Islamic Revolution.

Trump joined an Israeli bombing campaign last year that struck Iranian nuclear sites. He also threatened last month to intervene militarily during the protests but ultimately held back.

Washington has demanded Iran relinquish its stockpile of uranium enriched to up to 60% fissile purity, estimated last year by the UN nuclear watchdog at more than 440 kilogrammes, a short technical step from the 90% level considered weapons grade.

Mohammad Eslami, head of Iran’s Atomic Energy Organisation, said today that the possibility of diluting uranium enriched to 60% “depends on whether, in return, all sanctions are lifted or not”.

Eslami, quoted by Iran’s ISNA news agency, said another proposal — sending Iran’s highly enriched uranium abroad — had not been discussed during the talks with US officials.

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Khamenei adviser to visit Oman

Ali Larijani, a close adviser to Supreme Leader Ayatollah Ali Khamenei and secretary of Iran’s Supreme National Security Council, will visit Oman on Tuesday following the US-Iran talks, the semi-official Tasnim news agency reported.

“During this trip, [Larijani] will meet high-ranking officials of the Sultanate of Oman and discuss the latest regional and international developments and bilateral cooperation at various levels,” Tasnim said.

The date and venue of the next round of talks have yet to be announced.

Iranian President Masoud Pezeshkian said today that a new round of talks would offer “an appropriate opportunity for a fair and balanced resolution of this case”, adding that progress was possible if the US avoided “maximalist” positions and respected its commitments.

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Iran would continue to demand the lifting of sanctions and insist on its nuclear rights, including enrichment, he said.

Iran and the US held five rounds of talks last year aimed at curbing Tehran’s nuclear programme, but the process stalled mainly over disputes on uranium enrichment inside Iran.

Since Trump ordered strikes on Iranian facilities, Tehran has said it has halted enrichment activity. Iran has long maintained that its nuclear programme is solely for peaceful purposes.

The US wants to include Iran’s ballistic missile programme in the negotiations, but Tehran has ruled this out.

In a televised address aired today, Khamenei urged Iranians to take part in events marking the anniversary of the Islamic Revolution.

“The presence of the people in the march and their expression of loyalty to the Islamic Republic will cause the enemy to stop coveting Iran,” he said.