They key to killing Russians is to spurt their engine, at the time Russians were simply mindless Slovaks who thought of quantity/quality. Their engines can't take even the smallest of guns, got a pistol? Shoot it at their engine and watch their speed and overall ability to play the game decrease to bi-plane standards. This was fixed around the time of the Lavochkin-5 when the soviet union finally understood the importance of being earnest having some armor to protect the engine.
Other tips for combating with Russian bias is to not engage them in the first place, fly high and watch as they desperately try to pitch up at you, resulting in critical speed and in most cases, a flat spin.
*Russian planes can't climb well, and some of the yaks don't have WEP. Use it to your advantage.
*Overall the Russians meta is simply ground attackers, they're slow and low flying planes ie the Il2 and Il4. Watch out though because at low altitudes the Il2 can become a low flying ufo. Armed with 2x20-23mm cannons that shoot like crazy, im not sure you'd be alive if they caught you in their sights.
*The Ishaks and I85 are planes fitted with cannons to make your life worse, again lead above the engine and watch their plane come to a halt.
*When flying jets, say your payers because the Mig series is pretty much everyone's bane. Outfitted with a false statcard and historically accurate records, your sure aren't going to like tier V and so forth.
Also, if you have tracers, use them. A well placed burst can catch their tail or any other part of their tree planes on fire. Watch them burn.