Russia announced on Thursday that it would freeze the contract with Tehran for supplying S-300 air defense systems in line with new UN sanctions against Iran adopted a day earlier, Xinhua reported.
"The UN Security Council's resolutions are mandatory for all countries. Russia is no exception here. Naturally, the contract for the delivery of S-300 missile systems to Tehran will be frozen," said the Interfax news agency quoted a source as saying.
Iran struck a deal with Russia on buying S-300 systems in 2007, but Russia has delayed the delivery of the anti-aircraft missiles.
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.