Iran on Monday started talks with inspectors from the UN nuclear watchdog as well as Valentin Sobolov, acting secretary of Russia's National Security Council, reported the dpa.
A three-man delegation of the International Atomic Energy Agency (IAEA), headed by chief inspector Olli Heinonen, arrived in Tehran Monday morning and were to hold talks with officials of the Iranian Atomic Energy Organization.
Sobolov, who arrived Sunday night, had already started talks with his Iranian counterpart Saeid Jalili, who is also Tehran's chief nuclear negotiator.
Heinonen is reportedly to meet with the deputy of Iran's Atomic Energy Organization, Mohammad Saeidi, and the country's IAEA envoy, Ali-Asqar Soltanieh.
Foreign ministry spokesman Mohammad-Ali Hosseini on Sunday rejected press reports that Iran would discuss intelligence alleging Iran pursued nuclear weapons studies with Heinonen, saying that talks would only be within the framework of the IAEA and Nuclear Non-Proliferation Treaty (NPT).
Heinonen was in Tehran last week, but Tehran insisted that the visit was just routine and rejected Western press reports that the talks were solely focused on the new allegations.
The IAEA inspectors reportedly want answers from Tehran regarding intelligence received from Western member states on alleged studies of uranium conversion, high explosives testing and work on a missile re-entry vehicle, all of which have potential nuclear weapons applications.
Talks with Sobolov are mainly focused on the latest developments concerning the nuclear power plant at Bushehr in southern Iran. Moscow is cooperating with Tehran on building the light-water reactor.
The two sides are also expected to discuss last month's halting of a cargo of Russian heat insulators destined for the Bushehr plant which has not yet been released.
Foreign ministry spokesman Hosseini said Sunday that Iran was in constant contact with Azeri officials and the Iranian embassy in Baku to enable the urgent release of the cargo.