"It seems to me that it's not so much that war "is illegal" as "certain countries have declared a monopoly on force and have the means to enforce it.""
In some lines of thought, that's the definition of illegal...
In some lines of thought, that's the definition of illegal...
I mean, yes, they have peacekeeping forces. Those forces are not keeping the peace by force. In fact, there have been times when they have stood aside while one side violated the peace, because the UN force's rules of engagement didn't allow them to use force to prevent one side from starting the war back up.