I’m going to have to do some more testing, but it seems hard for the Allies to get troops to Europe fast enough to counter Japan’s surge in Asia. It will take the US a few turns to have their transports protected. It will also take UK a couple turns to have it’s fleet secure enough to dump into Norway or Karelia. Can Russia survive without support for a few turns?
I don’t do a ground surge with Germany right away (instead grab a bomber a turn to keep Allied boats sunk). You still make 4-5 tanks a turn which is enough to hold your eastern front. If you simply send 8+ tanks at Russia at turn they will get killed by counter attack because you’re two turns away from hitting. I’d rather keep Russia’s front line within tank range from Germany IC until Japan has Yakut, China and India secure. Then both sides advance while the German air keeps Allies away (you can trade Western Europe back and forth and it doesn’t matter anyway). By that time you have Africa secured and enough to send 12+ tanks into Russia a turn.
Maybe the Med Sea Russian sub idea really swings the African tide and allows US to spend more on convoy defense and less on troops to land initially.