Iran fully cooperated with the Internationa Atomic Energy Agency (IAEA) regarding three sites the UN nuclear watchdog claimed to have been "undeclared nuclear sites" in Iran, Atomic Energy Organization of Iran (AEOI) spokesperson Behrouz Kamalvandi said on Tuesday.

Kamalvandi rejected a statement made by IAEA Director-General Rafael Grossi claiming that there has been a lack of monitoring of Iranian sites, stressing that Grossi's words had "no legal basis".

"The Islamic Republic of Iran has been fully cooperative regarding the three alleged sites brought up by the agency and has sent information and answers to the agency's questions and has also held meetings to resolve the ambiguity," Kamalvandi noted.

The AEOI spokesperson called on the IAEA not to make judgments based on fabricated documents the Israeli occupation provided with specific political goals in mind.

That type of judgment is against the principle of neutrality and professionalism, Kamalvandi stressed. "Since the IAEA has audited all of Iran's declared nuclear materials and there are no disagreements over the calculated materials, simply observing contamination in a few places cannot be considered as implying the presence of undeclared nuclear materials."

Monitoring not conducted by the IAEA today used to be done under the nuclear deal signed between Iran and the P5+1 in 2015.

In late August, Iraniran Foreign Minister Hossein Amir-Abdollahian demanded that the IAEA drop the issue of what the Western parties claim to be "undeclared sites", as momentum builds to revive a 2015 nuclear deal.

The nuclear deal, formally known as the JCPOA, was tanked after the United States unilaterally withdrew from it in 2018 under then-President Donald Trump, who accompanied his arbitrary decision with the imposition of harsh sanctions on Iran.

Kamalvandi underlined that the monitoring and safeguards according to the Iranian parliamentary law, "The Strategic Action to Remove the Sanctions and Protect the Nation's Rights", require the parties to live up to their commitments under the JCPOA and remove the sanctions imposed on Iran.

After the IAEA's statement and demands regarding the safeguards and monitoring of the nuclear sites, Iran's envoy to the UN nuclear agency, Mohsen Naziri Asl, said the three safeguards claims raised by the agency are a "two-decade-old issue", but Tehran still appropriately and constructively cooperated with the IAEA to resolve them.

The International Atomic Energy Agency's Board of Governors adopted in early June a draft resolution submitted by the US and the E3, criticizing Iran for what they claim were incomplete answers given to the IAEA on uranium traces at "undeclared sites".

These claims were quickly refuted by the Head of the Atomic Energy Organization of Iran (AEOI), Mohammad Eslami, who said that Iran has neither secret or unwritten nuclear activities nor unreported nuclear sites.

Following that report, Iran abandoned all commitments beyond the Safeguards Agreement in response to the IAEA's Board of Governors' adoption of an anti-Iran resolution, an Iranian lawmaker revealed, condemning the resolution passed by the agency.