Why can Dandong Yalu River cruise ship enter the inland river of North Korea? North Korea is on both sides of the river, obviously in North Korea. Why can it enter?

You can check the treaties between the two countries online, which is unique in the world. Why do you want to sign this way? What is the international background behind it? There is no public information at present, so it is unknown. We locals think this is the traitorous behavior of the leaders at that time.

This treaty stipulates that the water surface is bounded by the shore. Only the water surface of the Yalu River, including the water surface between the two islands, can be used together.

What you see is "North Korea on both sides of the river", which is actually the water surface between two islands on the Yalu River. So, there is also water. Can't count as being in North Korea.