too much sunk cost for the russians to quit without having their nation implode (major reason the soviet union collapsed was under the stress of far, far less casualties in afganistan) they need some kind of win to show for all of the casualties and domestic problems they've had to put up with for ukraine, freezing the conflict now would put them in an incredibly compromised strategic position; not only would they immediately lose luganda and donbabwe, but those losses would encourage russia to re-arm and try again in the next ten years to grab even more land-- and tha'ts even without accounting all the worthless "peace deal" promises which all require effective disarmament as well as further territorial concessions/
Canada