All the Russian Air Force’s air defense missile units will be reequipped with modern S-400 (SA-21 Growler), S-300V4 Vityaz (SA-12 Gladiator) and short-range Pantsyr-S1 (SA-22 Greyhound) gun/missile air defense systems by 2020, Air Force commander Maj. Gen. Viktor Bondarev said on Friday.
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