I think this is only a big threat to South Korea. As far as I know, North Korea refuses to get in touch with the world, does not learn new things, and feels a little shut-off of the country. Just as the closed-door state of the Qing Dynasty in China of that year did you see how many years China finally went through The war was able to become an independent country. Now is the era of advanced science and technology. If you choose to cut off from the outside world, it will be equivalent to falling behind a large number of other countries. Science and technology determine the national military strength. I think this policy of North Korea is stupid .