Might is right?

Lots of discussion over the last few days about the legality, or otherwise, of wars. Given that war is the antithesis of the rule of law, I would have thought that the expression "a legal war" must be an oxymoron. You can certainly have an illegal war, but I think the best you can hope for on the other side of the coin is a non-illegal war. Given that the difference, it appears, can be no more than the interpretation of "two or three words" in a UN resolution, I have to say that that doesn't make me feel terribly safe.