The Iranian nuclear chief said on Wednesday the negotiations between Tehran and the International Atomic Energy Agency (IAEA) are "progressing," according to the semi-official Tasnim news agency.

President of the Atomic Energy Organization of Iran (AEOI) Mohammad Eslami made the remark in an address to reporters on the sidelines of a cabinet meeting, commenting on the latest developments in relations between Tehran and the IAEA.

Eslami said technical and expert delegations from the two sides are in close contact and report daily on the progress, adding that the results of the negotiations will be released at "due time".

The IAEA Director General Rafael Grossi paid a two-day visit to Tehran in early March, aimed at resolving some issues over Iran's nuclear program.

The visit came as the differences between Iran and the IAEA peaked over claims that "Iran's uranium particles enriched to up to 83.7 percent purity, very close to weapons," and Iran's "non-cooperation" with an investigation into traces of uranium at "three undeclared sites."

Iran rejected the first claim as "inaccurate" and the second as "baseless."

The two sides then reached an agreement on further interactions based on Iran's cooperation and greater openness to IAEA's inspections.

Iran signed the nuclear deal, formally known as the Joint Comprehensive Plan of Action (JCPOA), with world powers in July 2015, agreeing to put some curbs on its nuclear program in return for the removal of the sanctions on the country. The United States, however, pulled out of the deal in May 2018 and reimposed its unilateral sanctions on Tehran, prompting the latter to reduce some of its nuclear commitments under the deal.

The talks on the JCPOA's revival began in April 2021 in Vienna. No breakthrough has been achieved after the latest round of talks in August 2022.