Drone defense, incase Ukraine plays hardball.
The Russians ordered their troops to clean shave, but their chemical equipment is shit, out of date and poorly maintained and probably in short supply. If the Ukrainians are clean shaven too, it could mean trouble and extra equipment to deal with it sent to them. If Vlad is stupid enough to use chemicals on a city, it will be game over for him, he might as well use a nuke. If he uses it on the battlefield the Ukrainians might be better prepared for it than the Russian troops, and it could turn into a fiasco for the Russians and actually cause their defeat.