***until America was brought into the war by Japan. ***
The Germans were not happy about this! They were hoping for a Japanese attack on Russian ports in East Asia.
Yes, and then Germany (Hitler) declared war on the U.S.A.!
Things would have been a lot different if they had not declared war on the U.S.A.!
It appears the Japanese and the Germans were indifferent allies.
I’m no ww2 historian but what you said makes me wonder if Japan would have been more successful attacking Russia and solidifying gains and conquests ultimately ending up with more power and retaining their warlike culture by the time ww2 ended.