I actually have thought of Russia, especially if AV looms near for 43 or 44. I think it would take six months to cut Soviets in half and destroy and conquer everything to the south. Without AV, I don't think it makes sense to attack Russia...but if AV looms it is a solid gamble.
I wasn't think AV, but rather just not having that front active the rest of the game. If you push him off the board, his LCU's can come in, but none of his AC until he gets a base on map. No AC, you can always defeat him. You would be able to put ~2400 AV there and then free up all the rest. It isn't clear to me that the allies can win if you don't have SOV as a threat in the game. that extra ~4000AV is a big difference, not mention the economic benefit of holding CHina/SOV in the end game.
A bit of a reality check. In my Feb 1942 DBB game, the Sovs have 31 infantry divisions on the board. Dozens more brigades and regiments. One tank division and 13 tank brigades, plus smaller units. Artillery? Oh, my. I think there may be an over-focus on air power here.