Jus ad bellum
Jus ad bellum (/juːs/ YOOS or /dʒʌs/), literally "right to war" in Latin, refers to "the conditions under which States may resort to war or to the use of armed force in general". Jus ad bellum is one pillar of just war theory. Just war theory states that war should only be condoned under 'just' conditions. Jus ad bellum simply limits the causes for which war can be considered justifiable. The other parts of just war theory include jus in bello (just actions in war) and jus post bellum (justice after war).