I agree, but I am also specifically interested in seeing cooperation between Japan and China. Problems between SK and Japan can open up many possibilities, but of course, this gets political.
There is growing tension between Japan and S. Korea. They had their own mini trade war spat, deciding to cut off things that both countries need to make smartphones with. JSDMF anniversary last year, they invited PLAN, but not the S. Korean Navy.
In terms of cooperation, I kind of feel that China doesn't want to offend one over the other, and play a neutral tone in any of their dispute.