In an EV, it’s the IPC at the end of US turn that count. Turn 5 is if UK & US build IC in Asia. If they don’t, it’s an Axis EV by Turn 4.
Since Russia move before both Germany & Japan, it’s very simple to counter any Russian inf move eastward. Remember, you don’t care about being able to defend next turn, so you attack enough to capture. Just how many inf do you propose Russia should move eastward?
In regard to Pearl Harbor, since the battle only last 4-5 turns, don’t care too much about Jap Fighter. BB is more important because of the number of invasions that may be necessary (eg India, Australia, Alaska). Purpose of Pearl Harbor is not to kill off everything, it’s just to kill of the CV. The sub can be picked off later and the fighter is practically useless.
If US UK land troops in Africa, first, there won’t be much time to recapture Africa (Allies may capture Algeria, Libya, W Africa,C Africa for 4 IPC). Even with that lost, Axis can capture 20 IPC (assuming lost of Finland and Ukraine). So the only need 7 more. So that can try to capture Ukraine, Caucasus, and one of the 3 ter east of Russia or they can try to capture Ukraine and 2 of the 3 east of Russia. There’s no way Russia can defend all 5 territories (Ukr, Cau, and the 3 east of Russia). US & UK may help with Ukr/Cau, but that’s doubtful on turn 4. US won’t have time to recapture Australia/Hawaii. And if they pump troop into W USA to maybe recapture Alaska, that’s all the less troop in Normandy.
I presume the 90% Allies victory strategy is the “Conveyor Belt” method? The conveyor belt won’t stop this strategy (granted, it’s a do-or-die by Germany Turn 1. Capture Suez or die).