This is WRONG. I have seen Russia hold out on their own against Germany, Italy and Japan. Now, if you mean “help” by the UK and US attacking the Axis in other places, then yes they need that. But if you are talking about actual US and UK units being sent to Russia for defense, it is not necessary.
Not sure how you interpreted actual units in Russia, but I meant attacking Germany and Italy specifically.
One strategy I have seen work, and I know some people don’t like it, is infantry stacking for Russia.
It is impossible to determine if a specific strategy would always work. If this strategy in fact would always work, then in fact it is impossible for the Axis to win. If Germany by itself could not take Russia, then the game is historically and severely unbalanced towards the axis. Which is a different argument in itself. I don’t know yet how the balance of the game is due too to many variables, such as the expertise of the players since the game is still relatively new, mistakes made when great players get tired, and the luck of the roll. But this post is preferenced on an Axis clear advantage and how to balance it. My suggestion is to not play with the 6 victory city in the Pacific option. That allows the US to more efficiently spend most of it resources on Germany, thereby tilting the balance more towards the allies.
England kept Italy in check in the Med while bothering Germany from the back with SBRs and small attacks. The US spent most of it’s money in the Pacific and basically closed Japan off. Japan was still in the game but was making no money thanks to US convoy raids and SBRs. Their army on the continent got whittled down and ANZAC was taking their islands. When you get to that point, the US just has to keep a supply of subs to keep convoying Japan and bombers to keep the factories out of action. China and India will eventually wipe out the Japanese mainland army because Japan won’t have money to buy reinforcements for it. Japan becomes a “non-entity”. Then the US can send ships and troops to Europe to support UK and knock out Italy.
If this overall strategy relies on Russia holding out for a while, while the US first goes all out against the Japanese with the sole purpose of weakening them so ANZAC, China, and India can contain them on their own, thereby allowing the US to then go all out against Germany, I can’t say this obviously would not work. It may. My initial thought, based on the 10 or so games played with Europe and the 5 games played with Global, is it may work, but more victories would be obtained by the Allies if the US only helped minimally to contain Japan and spent most of its resources from the get go against Germany. Of course this carries a greater risk of losing the whole game when you play with the 6 victory city in Asia rule, which I abhor and never play with. There is too many other variables in this game and tactics, skill, calculated chances play a much bigger role in this game then the other smaller Axis and Allies version. This game is truly more like Chess than it has ever been before where the middle part of the game is purely tactics and not definitive strategy can be developed. Except for one. The war must still be one in Europe. That part of the game has not been changed.