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This video shows missile defense is basically useless against Russian or North Korean nukes

FILE PHOTO: A Terminal High Altitude Area Defense (THAAD) interceptor is launched during a successful intercept test, in this undated handout photo provided by the U.S. Department of Defense, Missile Defense Agency.  U.S. Department of Defense, Missile Defense Agency/Handout via Reuters/File Photo
FILE PHOTO: A Terminal High Altitude Area Defense (THAAD) interceptor is launched during a successful intercept test, in this undated handout photo provided by the U.S. Department of Defense, Missile Defense Agency. U.S. Department of Defense, Missile Defense Agency/Handout via Reuters/File Photo

Thomson Reuters

The US has spent billions of dollars developing a complicated network of sensors, radars, and interceptor missiles to thwart nuclear-missile attacks on the homeland, but a simple, cost-effective step could render them useless.

Oddly enough, it comes down to balloons.

When a ballistic missile is launched, the warhead separates from the rocket early in flight. The rocket then arcs above the earth back down toward the target.

Any country that can build an intercontinental ballistic missile could also build a handful of balloon decoys. Basically, the head of the warhead is packed with balloons. Once the missile leaves the atmosphere and the warhead releases, the balloons inflate, and one of them surrounds the nuclear warhead.

Because the warhead is now outside the atmosphere, the light balloons travel just as fast as the heavy warhead, and they all have the same radar signature. When the interceptor missile goes to hit the warhead, it finds dozens of balloons.

Hit-to-kill missile interception has been described as hitting a speeding bullet with another speeding bullet. Now imagine there are dozens of bullets, and some are fake.

Watch a video explainer on ballistic-missile countermeasures:

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