Speaking after President Vladimir Putin's meeting in Moscow with Iran's top nuclear negotiator, Saeed Jalili, Lavrov said that, "We noted the willingness of Iran to adhere to cooperation with the International Atomic Energy Agency, and Iran again confirmed its adherence to an observation of the Non-Proliferation Treaty."
"Putin reiterated his call for Iran's leadership to ensure honest and full cooperation with the International Atomic Energy Agency in order to clarify all of the issues interesting the agency," he added.
Western countries led by the U.S. suspect Iran of pursuing a secret nuclear weapons program but the Islamic Republic insists its nuclear research is civilian.
President Putin said earlier Tuesday Russia expects Iran's nuclear programs to be transparent and fully monitored by the IAEA.
At talks with Jalili, at the presidential residence near Moscow, Putin welcomed Tehran's cooperation with the IAEA.
"It's pleasant to note that contacts between Russia and Iran have intensified at all levels," Putin said, recalling that the Russian foreign minister had recently visited Iran.
Earlier in the day Iran had praised a U.S. intelligence report on its nuclear program saying that Tehran had halted weapons production in 2003.
The U.S. National Intelligence Estimate (NIE), published on Monday, contradicted a previous intelligence assessment in 2005 which stated Iran was actively pursuing a nuclear bomb.