A Russian official revealed on Monday that his nation signed a contract with Iran to supply the Islamic regime with the S-300 advanced missile system.
The official, Sergei Chemezov, is the chief executive of Rostec, a Russian state-owned defense conglomerate.
"S-300, the air defense system, the contract has already been signed," Chemezov was quoted by the RIA news agency as saying at the Dubai Airshow.
The sale of the S-300, originally conducted in 2007, has been repeatedly delayed due to Western pressure given that UN nuclear sanctions ban the delivery to Iran.
In August Russia’s deputy foreign minister Mikhail Bogdanov said his country and Iran had formally reached a deal for Moscow to deliver Tehran advanced S-300 missile systems, although the announcement never materialized.
The S-300 is a long range surface-to-air missile – manufactured by the Russian firm Almaz – designed to intercept aircraft and cruise missiles, and its most advanced models can also target ballistic missiles.
With the signing of the nuclear deal, which includes an astonishing Western commitment to help Iran protect its nuclear facilities against an attack, Moscow has revived the sale which had long been shelved.
It is estimated the system will make a strike on Iran's nuclear program far more difficult.