While you (falsely) accuse the Russians of targeting or, at least, not minimizing civilian causalities, Churchill absolutely no regard for the lives of civilians. And, I doubt he would have denied that.
Churchill moved WWII into total war mode. It is true.
To claim the Russians are constrained when it comes to civilian casualties is stretching things. Russians have developed a deserved reputation for ruthless warfare.
Restrained, "civilized" warfare only existed for a limited time, essentially between Christian nations constrained by religion. Even then, the "rules" were often ignored.
Everyone knows Churchill was all for bombing Dresden, but at least Churchill was killing HIS OWN troops, like the Russians did.