In this file photo taken on Tuesday, Aug. 27, 2013 a Russian air defense missile system Antey 2500, or S-300 VM, is on display at the opening of the MAKS Air Show in Zhukovsky outside Moscow.

Russian will start the delivery of S-300 air defense missile systems to Iran in “the nearest time”, RIA news agency quoted Russia’s Foreign Ministry as saying on Monday.

The Islamic Republic is also displaying interest in buying more advanced, S-400 missile systems, but no negotiations are being conducted at the moment on this matter, the agency reported.

Tehran agreed on a nuclear deal with world powers to curbing its nuclear work in July last year and international sanctions were lifted in January. But tensions with Washington have remained high as Tehran continues to develop its military capabilities.

Tehran and Moscow have also reportedly started talks on the supply of the Russian-made Sukhoi-30 fighter jets to Iran.

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