Iran has designed an air defense system with the capabilities of Russia's S-300 system, PressTV reported on Thursday."We have developed the system by upgrading systems like S-200 and we have tested it successfully using all our potential and experience in the Islamic Revolution Guards Corps, the Army and the Defense Ministry," Brigadier General Mohammad Hassan Mansourian told the Iranian television station.Mansourian added that details about the long-range missile defense systems will be revealed soon.Russia had cancelled a deal to sell the S-300 system to Iran in September, due to sanctions.