I'd point out Ukraine already kills Russian civilians. Already conducts terrorist attacks and feels fully justified in doing so because they are blood-thirsty, monstrous fascists being pushed to do something for the even stronger fascists their US masters. You have liberals in the US calling all Russians orcs, celebrating Russian tourists being killed in shark attacks. Ukraine is already fully unhinged, fully committed to terror tactics and will grow so even more so as their conventional forces fail and evaporate as the US demands punishment on Russian bodies and they don't give a fuck if those bodies are civilians or not. The propaganda for dehumanizing Russians has already reached its zenith, it can't go higher. They've staged false flag massacres, claimed all kinds of atrocities committed by Russians in areas they briefly occupied, and the western imagination does the rest.
More propaganda is not needed. If civilians were not incidentally killed, they would stage fake massacres as in 'Bucha' (sp?) or wherever that was. It's in other words irrelevant to propaganda.