The role of politics during World War 2 were to represent their own power and what they represented, mostly of thinking of themselves as overpowering the other nations.
Germany's power was sought out through the pain they had suffered through the first World War, and basically blamed their suffering on the other nations for it. Mostly the Jews.
The Japanese sought their power as forceful and military like. Physical power was of their means of godly output and improved their military, naval fleet, and air crafts to prove themselves worthy of dominating the Asian race and call themselves the dominant Asian race.
-I am only a student so if any of this seems irrelevant, please, go ahead and justify it so. :D Only trying to help because I saw nobody answered this question.-