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 The fact that Russia refrains from delivering the S-300 missile system to Iran is a clear breach of Tehran-Moscow contract, Defense Minister Ahmad Vahidi said on Wednesday. 

According to a contract signed in 2005, Russia undertook to deliver the S-300 missile system to Iran. 

However, Iran is currently negotiating with Russia over the deal, Vahidi stated. 

Vahidi had previously said that Iran plans to design a long-range anti-aircraft system as an alternative to the Russian S-300 missile system. 

He noted that a majority of Iranian experts are in favor of the proposal to design a domestically manufactured long-range anti-aircraft system as an alternative to the S-300 missile system. 

The S-300 system, which can track targets and fire at aircraft 120 kilometers (75 miles) away, features high jamming immunity and is able to simultaneously engage up to 100 targets.