It's going to be a massive counter-attack against a Russian army that is demoralised, poorly trained and undersupplied.
I won't be surprised if the Russian army implodes rather more suddenly than expected. The front line has more chance of surviving by turning around and fighting their own enforcement lines than by facing massed, technologically-advanced and seriously angry Ukrainian forces.
I wonder if the Ukrainians'll cease advancing at the border. My guess is Russia won't stop unless their own citizens are scared of losing territory. Maybe set up HIMARS on the frontier and start bombing anything military within 30 miles until Russia agrees to withdraw their army far away from it.
They need to lose and be seen to lose to change their aggressive culture.