The Ukrainians would be smart to establish as much fire control over Russians retreat routes as possible as we descend into the winter. The front line Russian troops will not be adequately equipped for the cold winter and resupplying them will be extremely difficult (if even a priority at all for Russian leadership)...
Freeze them out. Anti-personnel GMRLS, drone strikes and gps guided 155mm if they try to retreat to warmth. Maximize casualties if they try to exfill. Force them into the decision to 1). Surrender or 2). Die of hypothermia or other cold related illnesses in trenches and foxholes.
Ensure that the winter is miserable beyond all measure. Eviscerate their will to fight. Prolonged exposure to extreme cold will do that. Frostbite, hypothermia, gangrene, pneumonia, respiratory infections, etc... The winter can be a nightmare, in Ukraine's favour.
It's also important that us Westerners continue to stomach inflationary pressures in order to keep the arms flow heading into Ukraine. We can never forget that we're getting the cheapest price we ever will to neuter the Russian dogs, and Ukraine is willing and able to do the fighting on the ground, as long he we keep having their backs. We have the opportunity to not only set the Russian military back for multiple decades, but we can also deeply destroy their economy and supply chains, while cutting the average Russian off from a significant portion of the developed world in the process. It's time that we start liquidating the more than $300 Billion in Russian assets that we (the West) have frozen to this point. That's an enormous war chest to draw from and that money will go a long way to stabilizing Ukraine's economy at the same time.