War is never just and doesn't need justification either. War is a means of politics and usually used by those with superior arms and forces. For the weak to initiate war would be foolish, simply because they cannot expect to win. While there is no 'just war', war can be legitimate. These wars usually have to do with land and water and can be a means of restoring balance between peoples and other living things within a limited shared space. Wars between states or alliances/coalitions of states can never be legitimate.