Iran’s atomic energy chief said Tehran was willing to dilute its highly enriched uranium if the United States ended sanctions, demonstrating flexibility on key U.S. demands.

Mohammad Eslami made the remarks to reporters on Monday, saying Iran’s prospects of diluting its 60% enriched uranium, close to the weapons-grade threshold, would depend on “whether all sanctions will be lifted,” Iran’s state-run Islamic News Agency reported.

Eslami did not specify whether Iran expected all sanctions to be lifted, or specifically those imposed by the United States.

Diluting uranium means mixing it with mixed materials to reduce its enrichment level. According to the United Nations nuclear watchdog, Iran The only country without nuclear weapons Enrich uranium to 60%.

U.S. President Donald Trump has repeatedly called for a complete ban on Iran’s enrichment of uranium, a condition that is unacceptable to Tehran and far less favorable than the now-defunct nuclear deal struck with world powers in 2015.

Iran maintains that it has the right to carry out a civilian nuclear program under the Nuclear Non-Proliferation Treaty, a treaty signed by Iran and 190 other countries.

Eslami’s comments on uranium enrichment came as Iran’s Supreme National Security Council Chairman Ali Larijani prepared to travel to Oman on Tuesday. Host mediation negotiations between the United States and Iran.

Al Jazeera’s Ali Hashim, reporting from Tehran, said Larijani, one of the Iranian government’s most senior officials, may deliver information related to the ongoing talks.

Trump said talks with Iran will continue this week.

Negotiations ‘very serious’

The United States and Iran have sent different signals on the progress of the negotiations. Iranian Foreign Minister Araghchi said Iran was “very serious in the negotiations” and eager to “achieve results.” However, he said, “There is a wall of distrust against the United States that stems from the United States’ own behavior.”

Iranian President Masoud Pezeshkian said the ongoing negotiations were “an important opportunity to reach a fair and balanced solution,” Iran’s Islamic News Agency reported. He stressed that “Iran seeks guarantees of its nuclear rights” and the lifting of “unjust sanctions,” the agency added.

As far as Trump is concerned, Praise for latest round of talks On Friday, he called it “very good” but continued to warn that Iran would face “serious consequences” if it did not reach a deal.

“They want a deal because they should want a deal,” the US president said. “They know the consequences if they don’t.”

Before the two sides agreed to negotiate, Trump had repeatedly threatened Iran with a “more serious” attack than the one the United States carried out on three Iranian nuclear facilities in 2017. 12-day Israel-Iran war in June. He escalated the pressure by deploying aircraft carriers and accompanying warships to the Middle East.

Trump is expected to speak on Wednesday Meeting with visiting Israeli Prime Minister Benjamin NetanyahuHe is pushing for a tougher U.S. stance in negotiations with Iran, demanding concessions not just on its nuclear program, ballistic missiles and regional alliances.

Andreas Krieger, associate professor of security studies at King’s College London, said the United States and Iran appeared “closer to a deal” than they had been a few weeks ago, although the risk of conflict remained high.

“What Trump calls the (U.S.) ‘Armada’ is still in the region, so we still face coercion from the Americans against the (Iranian) regime,” Krieger told Al Jazeera. “But the pressure seems to be working and the Iranians have to make concessions.”

He added: “All the messages coming from the Gulf countries – Qatar, Oman – from all the players, including the Americans, have been very positive. The feedback from the Iranians themselves has been very positive.”

“I think the question we face now is how to translate the momentum we have now on the strategic framework into concrete details.”