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Link here. While most of the discussion about the missile threat from North Korea has focused on the possibility of it detonating a nuclear bomb high enough to cause an electromagnetic pulse (EMP) that would disable most electronic equipment, this article notes that they could much more easily do almost as much harm by simply using their ballistic missiles to fill low-Earth-orbit (LEO) space with space junk, thus disabling much of the world’s military surveillance and reconnaissance satellites.
I am not sure how much of a threat this might be, but I find the article somewhat worrisome because it proposes something that seems quite reasonable and doable, with the technology that North Korea appears to have, right this minute.