Russia Ukraine war, page-40307

they actually have pretty much destroyed Donbas ...most of the rest of Ukrain out of range for artillery and the missile supply hardly endless
so the Russians do what they are able to
oh ...and the Ukranians do have this annoying habit of blowing up Russian artillery

Putins stated objectives was to destroy nazis , protect Donbas citizens (mostly now dead or in Russia)and to deterr NATO - not inconsistant with turning the nation to ash and he has definitely been doing that in the parts he can reach .