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On paper, certainly. But a lot of those missiles have been stored somewhere in Siberia for 40+ years. Their condition is probably less than stellar. Who would regularly inspect and maintain random ammo dumps located five timezones away from Moscow in the middle of nowhere? I suspect that at least some of those missiles are outright out of commission and others are unstable enough to be a danger to the Russians themselves. Also, see this anti-aircraft gun in action: this video
