I have seen Russian success with a few tactical fighters being added into the mix in the early rounds. The accordion effect that Garganuta is the perfect way to explain the USSR’s ability, and need to counterattack the Germans. If you can slow them down/or force them to rely on Army Group North and the Leningrad route, by the time they have secured their position and line up for an assault through Smolensk or Bryansk, you will have a counter attack force supported by air in Russia that can decimate their entire attack.
Assuming the US and UK are starting to put the pressure on either in Italy or France, the German momentum comes to a dead halt on the Eastern front.
Another deviation from the turtleing Russia strategy is also to asses, and possibly stack around 4-6 infantry in Bessarabia, in anticipation of an Italian can-opener move. Yes, it leaves those infantry susceptible to complete annihilation if the German Lufftwaffe decides to spearhead the assault with the Wehrmacht on the ground on a G3/G4 DOW, however, that ultimately is the objective. If the Italian can-opener is not used to give the German fast movers and aircraft quick access to the Russian secondary defensive positions, the risk on attack for Germany goes up enough that they cannot just steamroll through to Moscow.
I know that I have a minimal amount of posts in this forum, however I have been playing A&A for roughly the last 20 years, and I consider my group to be “advanced”. Our games have gone from favoring the allies heavily, to favoring the Axis heavily on G40, but they are now going back to the favor of the Allies, and that is with no bid, and a house rule implication of research tokens.