Curious question: how is a war illegal? Isn’t that just… war?
Or at least, most wars seem to be like that. Rarely is there the case where 2 countries consent to have war with each other. There always seems to be someone that aggresses and someone that is forced to defend. For if they wouldn’t then they face subjugation or worse.
Russia never sent a war declaration to Ukraine. It's not legally a war (that's why Putin and cronies call it 'special operation')
What the hell. Just because it's not called by a country like that doesn't mean it is one.
hence "illegal". A legal war have a war declaration and an explicit casus Belli (regime change, "removing terrorist", "protecting the civilians" etc)