ORIGINAL: EwaldvonKleist
From my liited exp. the best fighter for airfield bombign is the Mig 3 due to speed and good range. If you threaten Moscow, he has to evacuate and will be short of them. In this case you only need to move your bases a few hexagons back and his bombers are unprotected. Cross cover of the air armies is also a good way to make airfield bombing too costly. Stacking all fighters of an air army on one base should also help.
The Mig3 is indeed the best early war fighter the Sovs have. What it also has is good high altitude performance. I don't know if it is used by the engine though. In any case, nothing the Sovs have can beat an bf109 F4 in expert hands. It's probably due to my mishandling of my airforce, but I find the Sovs a bit to good in the air.
There's a lot more to come [;)]
Actually, if you want to dive a bit deeper into the historical air battles in the East, try the series by Christer Bergström.
In short: the Russian pilots were so inexperienced they where sent to the front after only 4-5 hours flying time. Compare this to Navy Seals fighting conscripts who haven't fired a shot before being put to the front. Guess who wins [:D]