@PainState:
I think the discussion should be how do the Allies accomplish this goal. IMO a massive stack of Russian INF sitting in Moscow with some Allied air support does not accomplish this goal on the Russian front. It just leads to the standard, been there done that, dice fest on G6 or G7 on Moscow.
If we factor in the British and the Americans, we may be able to turn the Bryansk scenario I described around in Russia’s favor. They can add 10 bombers, 5 fighters and 1 tactical bomber minimum to the Bryansk stack and make it hold even against a German all-in. The British can also kick in a tank and a mech from Egypt.
Maybe this is the best Red Tide strategy. From turn 1, the Allies stack Bryansk with everything they have, and then they attack on any battle where the odds are 50/50 or better. The British with their fast movers and modest air force, and the Americans with their bomber stack, can annihilate small German and Italian troop elements or mop up after the Russians throw themselves completely at the German stack.
The purchases would look like this:
Russia
R1 9 artillery
R2 9 artillery
R3 6 tanks 1 mech if attacking R4 / 10 infantry, 2 mech if not
Americans
A1 4 bombers
A2 4 bombers / 6 bombers if Japan went J1
A3 6 bombers
British
B1 6 infantry, 1 fighter
B2 1 bomber, 2 minor ICs for Persia and Iraq
B3 4 mech, 2 tanks
The purchases beyond these would depend on how the board looks on R4.
The biggest problem as I see it with the hold Bryansk strategy against a German / Italian all in is the possibility that they will take the northern route for the Smolensk can opener threat, forcing Russia to keep a small stack of infantry there that can withstand the Italians. If the British rush to join the stack, they can be the ones to retake Smolensk from the Germans starting on B6, but Russia will have to take care of defending the territory on R4 and R5.