The final battle for Kupiansk resulted in the annihilation of remaining Russian defenders, most of whom were in scattered hideouts in basements and in the city hospital, which had been turned into a bastion.
The Ukrainian assault plan was methodical and relentless, using drones to identify even the smallest troop concentrations, then calling in bomber drones and artillery. Where survivors remained who refused to surrender, explosives were used to bring down the buildings in which they had taken refuges. The Ukrainian victory was a tactical and strategic triumph which brought to bear all of the Ukrainian military's experience, skill and remorselessness. JL
RFU News reports:
The battle for Kupiansk reached its conclusion as the final strongholds of Russian resistance were concentrated in the hospital, the mechanical plant, and a school. Drone operators equipped with thermal imaging mapped enemy positions, identifying concentrations of Russian troops. FPV drones targeted basements, and fires were set to flush out entrenched Russian fighters into exposed areas, while Ukrainian troops advanced with explosives to neutralize resistance. The final and most heavily defended position remained the hospital and two apartment buildings, which had been turned into a bastion. The Ukrainians deployed snipers with thermal optics, eliminating any movement detected on upper floors of the buildings. FPV drones struck holdouts. Rather than risk casualties, commanders ordered 100 kilograms of explosives to be used to destroy the structures.