The problem with war is that you might not want it, but it’s enough if somebody else does. What sort of diplomatic magic was there do you think to have stopped Hitler in late 1930s? Let him rebuild industry and military? Allow him to cease the payment of reparations? Meet with him in person and treat him as a sane person? Give him Austria? Give him Poland? Well, Europe did all of that and he still went after France, Great Britain and Russia. And he wasn’t rational too and it was very likely he would fail. What about Putin? He got Chechnya, Georgia, Crimea, most of Donbass, not to even say much of billions in trade, and he still went after the whole of Ukraine. The thing about tyrants and bullies is that the only thing they understand and respect is strength in form of kinetic force delivered as a fist to their face or explosives to their forces.