War Is Illegal - Even in Libya http://warisacrime.org/content/war-illegal-even-libya

It's a simple point, but an important one, and one that gets overlooked. Whether or not you think a particular war is moral and good, the fact remains that war is illegal. Actual defense by a country when attacked is legal, but that only occurs once another country has actually attacked, and it must not be used as a loophole to excuse wider war that is not employed in actual defense.