The inanity and insanity of humans is that we have rules for our violence, from war to fighting sports.
Incidentally, no, what Russia is doing in Ukraine is not even anywhere remotely close to a "proper" war.
For example, they deployed gas that makes people vomit so soldiers can't keep masks on, followed by gas that dissolves the lungs so they suffocate on their own blood. Stuff that makes dying by conventional means merciful.
You don't plan for everything going well (no one ever goes for war). You plan for when things don't.
https://acoup.blog/2020/03/20/collections-why-dont-we-use-ch...