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Before the world can be attacked by space zombies they would have to get through our first line of defence - "Space debris :)" - when this happens our western earthlings can sit back and say "this was our calculated effort in protecting the earth " while we all watch the alien space crafts as they plummet helplessly into the earth due to damage from Space junk.
Can't have this as a movie plot though it would all be over within 5min.