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Sea mines
Not the most convenient and not the most advanced development, which in its arsenal has not only China, but also North Korea, Iran, the USA and even Russia. The use of such mines may not always be justified since to put them at the bottom of the sea from the storage is another task. Of course, you can drop them from the plane, but it is not only very expensive, but also unsafe, because it can cause a lot of suspicion from the enemy and then there will be no sense in using these mines.
