All the varied risks you could take with Russia all serve to make you weaker in the final battle. Russia is weak enough OOB that simply put, they’re all distractions (china, siberia, xforce to iraq, scandanavia all of it) and alot of these moves just hand the Axis extra money when Moscow finally falls.
On the other hand, if you make Russia even slightly stronger, and Germany’s income slightly smaller, there is a big effect 4-5 turns later, such that Russia isn’t easy to conquer at all. That is why germany pretty much has to declare on G2 or do a G1 and leave the UK a partial navy.
Russia needs to be Goldilocks. Not too strong, not too weak. It should fall in the face of an all-in Axis effort–but if that all-in effort is too costly then the UK and US will and should eventually win the game. That is the most interesting and balanced game that can come of the G40 setup, IMO.
OOB, Russia doesn’t have many of the things it needs to have those choices, it only needs a bit more to get to being “just tough enough”.
You really shouldn’t take some of the key factory placement areas with Russia (Finland, Norway, Iraq, Persia) because Russia can’t spare any income to buy or fuel factory areas, and once Russia has taken those zones, the UK and the US cannot.