Just war theory is a doctrine that has been studied by all kinds of leaders, religions and especially military leaders. Basically, it is a doctrine that includes all kinds of military ethics of war and is broken down into two parts, Jus Ad Bellum and Jus in Bello. Just ad bellum is made up of 5 parts, the first part is legitimate authority and this means that the people who make the decision for war are recognized officials and understand the strategies of war. The second reason is to have a just cause, to have the right reasons to wage war and to understand that violent aggression is not a plan. The third is that the last resort is to go to war and be able to understand that before a country starts a war, it can be resolved in a less violent way. The fourth option is the prospect of success. Yes, winning the war is a success, but how many lives can be lost and still consider that a success. The last option is political proportionality and this is where the harm of war is proportionally less than the harm of wars. I believe that if all non-violent Just ad bellum options have been tried and given a fair chance and the only viable option is to go to war, then going to war is acceptable. But if all non-violent options have not been exhausted and war is nothing more than a quick decision, it can be considered a mistake and