Russia definitely has to fall as quickly as possible or the Axis is likely to lose. I like to use Germany’s aircraft and totally decimate the allied fleet as much as possible on the first turn. Even if the German air force gets wiped out, it’s ok. Just keep attacking ships as long as you can. Then, Germany needs to move troops toward Russia, but not attack. Just build up troops. Keep your armor in the capital and replace the troops you move toward Russia with ones you buy(buy only troops for Germany for the first few turns). If Russia attacks, they’ll probably lose a lot of troops and you can use the troops and armor from the capital to counterattack if they take the territory.
If the German air force succeds in wiping out the allied fleet, that will postpone a full scale invasion and keep Britain from helping Russia. If you fail to take them all out, it can be a problem, but Germany should be able to hold it’s own for awhile.
I never mess with asia in general to start with Japan. If the allies take ground, they take ground. I move the Japanese fleet right off Japan, buy troops, tanks and transports, then attack Russia from the other side furiously by getting a steady flow of troops from Japan pressing relentlessly toward Russia’s capital. I ignore anything else unless the American fleet starts island hopping, then maybe I’ll fend them off with part of the navy. If the few allied troops in asia attack the flow of Japanese troops, they’ll usually get eaten up. A good player may drop a factory for the U.K. in India, but that’s alright. The allies start very weak in asia, so take advantage of that to hit Russia hard while Germany starts out on the defensive where the allies are stronger.
If America get’s too cocky, you can usually interrupt things long enough to whack Alaska. That draws them north, away from the islands and you can move back to Japan and start hitting Russia again. Just don’t linger around Alaska too long or you’ll get caugt up in it and lose momentum against Russia.
Once Japan pushes up far enough and is attacking Russia’s capital, then Germany can blitzkreig from the other side, but not before. If the first wave takes too many casualties, retreat and build up again. The whole thing is to force Russia to defend Karelia without weakening Germany too much. That prevents Russia from Fighting Japan because they have to keep building up to protect from Germany. If they don’t, you’ve got them anyway. If possible, do strategic bombing on Russia as soon as you can to take away IPCs.
Russia must fall and fast if the Axis is going to win. It all hinges on that.
Things can go wrong. Bad dice rolls or good opponants but you react the best you can and keep focused on Russia. If the allies can keep Russia in the game long enough, Germany will weaken. In that case, just conceed the game unless you feel like playing until you eventually lose.
Probably seventy percent or more of the time, this strategy works for me, depending on the dice and my opponant.
Good luck.