They don’t, they just get ready to clutch their pearls and say “well, I never…” when it happens again. These people are from the same stock that let Hitler rise to power, and thought appeasement was the best way to deal with aggressive authoritarians. Anything short of full liberation of Ukraine’s territory only encourages Russian belligerence.
You want to save lives? You make it clear to Russia this kind of shit will only leave them bloodied and empty handed.