Mantle, there are quite a bit of increases to the Axis that make Russia easier.
1) No more 12 IPC if Japan attacks.
2) What Russia does get if Japan attacks is easily crushed under the jack-boot of Japanese imperailism
3) No more sea lion means no more need to build transports.
4) Submarines do more convoy damage now, reduced naval expenditures.
5) Lots of free AA Guns. Does Russia lose planes (and htey will eventually) or do they lose Armor (which they have to lose instead of planes) or do they retreat?
5.1) If they retreat, Germany makes more, Russia earns less.
5.2) If they lose planes, Germany has less defense to break, Russia can ill afford to replace planes, Germany has to lose an awful lot of planes to need to replace them, and if they find they do need to replace them, they earn significantly more and can afford it.
5.3) Likewise arguement for armor. Russia can not afford to lose 1 or 2 armor each round retaking land. Germany can.
How does Russia respond to:
6 Infantry, 2 Armor in Arkhangelsk
10 Infantry, 3 Artillery, 3 Armor, AA Gun in Baltic States
10 Infantry, 3 Artillery, 3 Armor, AA Gun in N. Ukraine
20 Infantry, 5 Artillery, 6 Armor, 5 FIghters, 5 Tactical Bombers, Strategic Bomber, AA Gun in E. Poland
2 Infantry in Belarus
?
They cannot. They do not have enough firepower to bring to bear on all those points. Therefore, they have to choose and whatever they choose, they will lose more, in proportion to what they can build, than Germany will. With moderate investment by the Italians, the forward German headquarters can inch forward territory by territory while the Russians deplete themselvess against moderate stacks of German forces, or if they retreat, the Germans can surround Moscow faster, thus, reducing the number of units defending it.
Japan, following up, can sap the strength from the East.