So one has to address the use of war for foreign policy objectives. At the end of a war, we have negotiations. We had years of negotiations at the end of the Korean War. What we have to do is move to holding similar negotiations before the first shot is fired. That assumes good faith on all sides which isn't always the case.
Negotiations take place under very different conditions after the war has begun.
War actually makes negotiations more difficult because you get the revenge factor. But you just said that negotiations succeeded after wars when they didn't succeed before. You can't have it both ways. I said that they always occur after wars. Finally somebody talks both sides into negotiating.