The basic idea of occupying the Sudeten land, Austria, Checoslovakia, (collective known as `The Flower Wars`by the Germans was also to return to the German Bosom territory lost through the Versilles treaty Poland was to return Brunswick (if my memory serves me right) mainly German speaking peoples.
As to Russia though there were great gains in regards to resources, and he obviously felt that he was `on a roll`maybe also spurned on by the positive result of the Russo -Japanese war of 1906 for the Japanese in knocking Russia`s title of a super power.
Japanese and Germany politico`s had great respect for each other`s fighting forces and had peaceful conferences on several occasions, Germany even managed to sell them a couple of panther tanks but i belive they never got them.
Maybe it was thought that by fighting the allies in the far East by the Japanese would maybe draw them away from the European theater ??
Ashley