I can only say so far, that my barbarossa has been a pain in the ass for me trying this scenario, russkies' infantry is the same as mine, luckily i still have better decyption and stuff.
I, stupidly didn't know what was required of the bf-109 G-6 version of the messerschmitt (fighter), thus I was left with shitloads of biplanes for France :rofl: British and canadians had spitfires by then :wacko:
I did manage to subdue poland but the horrible scores of bombers just poured into ruhr area, and I lost some 20 IC to the bombings, I couldn't upgrade my inf anymore, and 2 panzers were delayed. I still rolled over France with luck I guess, French had surprising amounts of infantry, which was annoying as hell,
So, my suggestions, get some decent aircraft, interceptors preferrably, less malus with none of the worthless tax techs to kill your research in order to finally get to the messerschmitt G-6 fighter tech,
Russians might just as well have hoaRDes of Arm-II, that is in mod34 the pzkmpf 3, when you finally invade. I'd just get lots of good infantry. dont forget land doctrines and decryption from the infantry page and panzers!
also, do get the tiger prototype so you can build tiger divisions, and don't forget either SP-rockets or StuGs (i guess, idk what's the best brigade for them)