I agree with your implication. The military forces of Russia are not paper tigers. Don't believe the hype. But at the same time, you don't want to fight proxy wars? Ok. Great. Then don't screw with other nations. If they hadn't messed with Ukraine, they wouldn't be fighting a proxy war.
The system works, again, because each of the major powers are comfortably confident in their ability to destroy the other 3. There is therefore, nothing to stop us from fighting a proxy war with Russia, because Russia will never use hard power to do anything about it. Unless Russia is suicidal, and they aren't, they will not escalate to a direct conflict with us.