Russia is resolving the technical problems...

"A few technical faults have been detected in the radio-frequency band [command and control system]. We are currently fixing them," first deputy director of the Federal Service for Military and Technical Cooperation Alexander Fomin said.

Russia signed a contract with Iran on the supply of at least five S-300 air defense systems to Tehran in December 2005. However, Moscow has not so far honored the contract, which many experts say is due to pressure from Washington and Tel Aviv.

Both the United States and Israel have not ruled out military action if diplomacy fails to resolve the dispute over Iran"s nuclear program and have expressed concern over S-300 deliveries, which would significantly strengthen Iran"s air defenses.

Matters came to a head last week after Iran announced it had developed its own air defense system comparable to and even more sophisticated than the Russian S-300 system.

Iranian Ambassador to Russia Seyyed Mahmoud-Reza Sajjadi earlier

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