What I meant was that two tyrants who wanted to take over the entire world would inevitable clash. There is no way around it. What would the form of this clash be like?
I've never heard of Adolf Hitler as well as the Japanese military government wanting to take over the entire world.
A power clash would not be inevitable as you make it seem. The Japanese would have no desire to expand beyond Eastern and Southeastern Asia, and I'm hard-pressed to see a reason why the Reich would want to take on the logistical nightmare of trying to conquer the Empire of Japan. I think at most local proxy conflicts on the fringes of their respective spheres of influence is what we'd see, just like the OTL cold war.