Russian Defence Minister Sergei Ivanov said a contract to deliver TOR-M1 missiles to Iran had been signed.
Iran has reportedly agreed to buy 29 of the mobile air defence systems in a contract worth more than $700m (4,7 mrd kr).
Earlier, Iran announced that it was planning to build a second nuclear power plant in the south of the country, despite coming under pressure from the international community over its nuclear ambitions.
Earlier this year the Russian government faced criticism from the West when Moscow agreed to sell missile systems to Syria.
