I'd actually say the Russians will want the Ukrainians to back off on their own. They can't do anything real without their air force. Merely dedicating 100+ Su-24/25 would do wonders, but they seem to have decided not to do that.
Ukrainians can do a lot "real" without air superiority. They already did something real aka, breaking the Russian Northern offensive and driving Russian forces in the north back to Russia.
Ukraine doesn't need air superiority, they just need to deny Russians air superiority. Invaders need air superiority more than defenders already stationed in defensive positions. Ukranian UAV- artillery combination is causing heavy toll on Russians.