The Cadian Empire, Alleghany and the Xinxi City state will continue to exist as non-player nations. Everybody is free to interact with them. This includes going to war and occupy them. Ofcourse this is not something that can be done with a few post. There have to be posts with the discussion of the war, the planning, the troop movement and while all that is happening, the NON-Player nations will mobelize and look for diplomatic solutions, allies and so on :)