"We signed a contract with Russia. It is being done. We will acquire a large portion of the systems by the end of this year," Hossein Dehghan told state television late yesterday.
He said Iranian troops were being trained in Russia to operate the surface-to-air missile systems.
This week, the state-run Russian Technologies corporation (Rostec) announced the signing of a delivery contract in Tehran for S-300 missiles.
Moscow in April lifted a ban dating from 2010 on selling the missile systems to Iran, ahead of Tehran sealing a final historic deal with world powers in July to curb its nuclear programme.
Russia will provide Iran with a "modernised and updated" version of the missile systems, following up on an initial contract signed in 2007, Rostec Director General Sergey Chemezov said in a statement.
