During the invasion of Ukraine, we have heard frequently terms like ‘war crime’ and ‘just war’. In a fight to the death, when your aim is the taking of the life of another human being, the idea of there even being such a thing as a ‘crime’ or ‘justice’ in that context is seemingly absurd. Furthermore, institutions like NATO are endlessly discussing the ‘rules of conflict’, while in the UN Security Council Russia absurdly has a veto ruling out action against its own aggression. Seeming absurdity on top of seeming absurdity. But the rules of war are necessary. Defining terms like ‘war crime’ and ‘just war’ do have a clear and important role to play, even in the face of the chaos, the heartache and the bloody killing of war, writes Saba Bazargan-Forward