If Japan stays out of China after 1931, can they get any territory from joining the Allies or promising to stay neutral?
Like agreeing to respect the Soviet Far East and declare war on Germany in exchange for the chance to buy North Sakhalin following Barbarossa, an opportunity to buy colonies from any of the financially ruined WAllies, or anything? A Permanent Seat on the UN Security Council or recognition of Japanese dominated Manchuria post war?