TEHERAN - Iran on Saturday dismissed a report by the UN nuclear watchdog as "politically motivated and lacking balance," saying it failed to "accurately reflect the scale of Teheran's cooperation" with the International Atomic Energy Agency (IAEA).

In a joint statement issued by the Foreign Ministry and the Atomic Energy Organization of Iran, Teheran criticized the report -- compiled by IAEA Director General Rafael Grossi at the request of the agency's 35-member Board of Governors -- as misleading. The report was leaked to media outlets earlier in the day.

The IAEA document said Iran had not fully accounted for nuclear material found at three undeclared sites and continued to provide "less than satisfactory" cooperation. It also flagged unresolved questions over uranium traces discovered in past years at several locations.

The report comes amid indirect US-Iran talks mediated by Oman, with five rounds of discussions held since April -- three in Muscat and two in Rome -- focused on Iran's nuclear program and the potential lifting of US sanctions. A sixth round is anticipated in the coming days, though the date and venue have not yet been announced.

Iran maintained it had engaged constructively with the IAEA under the framework of the Non-Proliferation Treaty (NPT) and its Comprehensive Safeguards Agreement.

"Unfortunately, despite this extensive cooperation, the report fails to accurately reflect the level of Iran's engagement," the statement said, adding that the document blurred the line between Iran's legal obligations under the NPT and its voluntary commitments under the 2015 nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA).

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Teheran also accused the United States, Britain, France, and Germany of repeatedly breaching the JCPOA and UN Security Council Resolution 2231 through "illegal" sanctions and political pressure.

Iran condemned the report as a product of external influence and warned that if it is used to justify further action against Teheran at the IAEA Board of Governors meeting on June 9, it would respond with "appropriate countermeasures" to protect its legitimate rights and interests. 

Nuke talks

Also on Saturday, Iranian Foreign Minister Seyed Abbas Araghchi said his Omani counterpart had presented the "elements" of a US proposal to Iran.

He made the remarks in a post on social media platform X, announcing that Omani Foreign Minister Sayyid Badr bin Hamad bin Hamood Albusaidi had paid a short visit to the Iranian capital earlier on Saturday to present a US proposal concerning a nuclear agreement between Teheran and Washington.

READ MORE: Foreign minister: Iran to continue uranium enrichment on its soil

Araghchi added that the US proposal "will be appropriately responded to in line with the principles, national interests and rights of the people of Iran."

Commenting on the ongoing nuclear talks in an address to reporters at the White House on Friday, US President Donald Trump voiced optimism about reaching a nuclear agreement with Teheran, saying, "I think we have a chance of making a deal with Iran."

His remarks came as, in recent days, the United States has repeatedly demanded that Iran completely cease uranium enrichment, a request firmly rejected by Teheran.