I'm thinking about writing a timeline, and one of the key points would be China and North Korea cooperating more closely with the Soviet bloc. I'd like to have an explanation beyond a handwave for this level of cooperation, and one of the ways I figured this could be achieved would consist in those two countries joining COMECON a bit before the Korean War. If there are reasons why this can't be done, tell me now so I can either figure some other reason out or try a different TL.