Actually Chiang is also doing it for himself. Despite already knowing Japan is going to be defeated, it is still too close a struggle to allow them any breathing space.
Also it's not like China hadn't already suffered enough by then, war started between Japan and China a few years earlier than WWII, and we've learned from previous deals that Japan simply cannot be trusted.
Also it's not like China hadn't already suffered enough by then, war started between Japan and China a few years earlier than WWII, and we've learned from previous deals that Japan simply cannot be trusted.