Nice move. And it isn’t the first time where I seen a strong Japan go all out for Tech Rolls after Germany has fallen. Even then HBRs hardly show up, but the Hawaii-Alaska move you pulled off is an excellent way to use them.
However, even with three Allies, it is still possible to take Russia (provided most Allied forces are stacked in Germany, Eastern Europe, Kaarelia). The difficulty is holding Russia. Here’s my ideal situation (sorry for the repost):
Japan should position itself in is this:
a. Let Germany fall to the Russians (now in really life Patton and his 3rd should’ve taken Berlin… but that is a different story).
b. If you really want to damage the Allies in the long run, also let the Russians take Eastern Europe, Norway, and Ukraine on the previous turns, and on the same turn Berlin falls, let the Russians take Southern Europe.
c. On Japan’s turn, use your massive ARM, ftr, and inf force to storm Moscow! (again, not in real life… but it’s just a game)
d. Now by Japan taking Moscow, what have I done? Not only is Russia knocked out of the game, but most of Eastern Europe along with it. The former territories I told you about: Ukraine, EE, SE, Norway, and Germany have all effectively become worthless territories (not to mention Karelia and Caucasus until Japan can take them). Effectively I have robbed USA and UK of (3+3+2+6+10) 24 potential German IPCs!
e. Now this is the real killing joke. When I take a Capital that means I collect all the IPCs that the former owner of the captured capital has. Not only am stripping the Russian economy but the Germans IPCs too, which were previously under Russian control.
f. Spend all my money on tanks and infantry from which I can overrun the Allies.
Again, this too requires a lot of luck, but this way I won’t run the risk of having to drive into tech rolls.