Generally follows thing you may want to adjusted.
Mostly Russians notes.
IL-2 Shturmovick was a great tactical Bomber. it is not an interceptor as in the current mode. It has high survival rate. So may be more offense and hp bonus for it.
History Russian T-34 is a excellent tank, but only 7 T34s can match one Tiger (10 M26 can match tiger with chance time to survive around 2-3 of them) but the cost of 10 34s equal 1 tiger. The most tigers was killed by aviation.
The 3 Russians heavy tanks IS-2 can make one tiger.
The early panzers have huge problems with both of them. The king tiger or tiger 2 was even superior over tiger, but with the higher cost to build and transmission problem.
I think adding defensive bombardment to the naval ships will help AI to stay longer.
After Kiev fall I have advance to Moscow in the same turn. Because there is no forests or swamps in between.
I also could suggest to add some defensive immobile lines around Leningrad, Moscow, Smolensk, Odessa and Stalin grad.
Russian anti tank 45 mm artillery was one of the greatest anti tank units. German actually have huge problem with they anti tank till almost end of 43.
Russian infantry was much more stronger defensive than offensive during start of the war so 8/10 not 10/8 should be in stats.
And there is no Katusha for Russians

( Take modern artillery put movement 2 bombard 20...
Russians marines was creasy offensively. Germans are fear them a lot.
May be it good to put Russian and American in locked alliance without any initial enemies?
German interceptors was stronger the others for a long time until Americans advanced in around 43.