Russia’s Federal Service for Military-Technical Cooperation denies negotiating deliveries of S-300 air defense systems to Iran Friday. Media earlier reported Iranian Defense Minister Mostafa Mohammad Najjar as saying Russia had agreed to deliver an unspecified number of the system to Iran under a previously signed contract. The US government expressed "concern." Earlier this year Moscow overrode US opposition by delivering to Tehran 29 TOR-M1 air defense missile systems estimated to be worth 700 million dollars. The Iranian state media claimed the S-300 is even more sophisticated than the TOR-M1, saying it could hit incoming enemy targets at a greater altitude.