Iran on Sunday confirmed a deal with Russia for delivery of a new air defence system to the Islamic state, the official news agency IRNA reported.
The deputy head of the parliament's security commission told IRNA that after several years of negotiations, Iran reached an agreement with Russia for delivery of an S300 system - also known as SA20 - in the near future, dpa reported.
Ismael Kowsari said the system would strengthen Tehran's ability to defend the country's airspace.
Despite US and Israeli concern, Russia not only has military but also nuclear cooperation with Iran. The joint nuclear power plant on the southern Iranian island of Bushehr is to become operational in 2009.
While Iran insists its nuclear projects are only for peaceful purposes, the West fears that Iran would use the technology for a secret nuclear programme, mainly aimed at attacking political arch-foe Israel, which Tehran does not acknowledge as a sovereign state.
Western concerns have intensified since Iranian President Mahmoud Ahmadinejad threatened to wipe out the Jewish state from the Middle East. Ahmadinejad has also constantly doubted the historic dimensions of the Holocaust in the Second World War.