S-400 missile defense systems

Targets medium-range theater ballistic missiles, which travel at about 3 km/s (6,700 mph) or less. In this context the term "theater" means the entire localized region for military operations, typically a radius of several hundred kilometers. Defense range of theater defensive systems is usually on this order. Examples of deployed or soon-to-be deployed theater missile defenses: THAAD, Airborne laser and Russian S-400.

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