Russian Foreign Minister Sergei Lavrov said Friday that President Dmitry Medvedev would issue an order listing weapons prohibited for export to Iran in light of the new sanctions imposed on Tehran by the UN Security Council.

The Russian top diplomat said in Tashkent that if S-300 missile systems are included in the list, then the long-protracted delivery of the missiles under a contract with Tehran will not take place, Russian news agencies reported.

"An appropriate decree will be drafted. Both this decree and other appropriate documents will clarify deliveries of which kinds of weapons do not fit within the framework of the resolution," Lavrov said.

This has been the most unequivocal answer from Russian officials as to whether or not it would fulfill the contract with Iran signed in 2007 on the supply of S-300 missiles.

A Kremlin official said earlier Friday S-300 missiles fell under new sanctions imposed on Iran by the UN Security Council.

On Thursday, Lavrov told reporters in Tashkent that supplies of defensive armaments to Iran will not be affected by the new sanctions.

The S-300 air defense system is an advanced mobile system that can shoot down aircraft and cruise missiles from up to 150 km away. The United States and Israel oppose the sale of the missiles to Iran.