Thread title is very misleading.
China didn't "shoot down" anything. They sent a payload into space, and part of that payload was a device which tracked and attached itself to a weather sat, and then forced the sat into a decaying orbit. It isn't entirely clear that it exploded, but may have just been a significant push or a minor detonation to damage the sat's own stability gear, example, or to damage the communication gear in such a way that ground stations could no longer keep it in orbit.
It does, however, bring the whole arms race to space, which is not good.
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