Diplomacy is always the best solution. After all, diplomacy - aka appeasement - gave us World War II, and frankly you can't get much more of a good outcome than that. So let's rush to give Putin a way to hold on to all the Ukrainian territory his forces have seized, and leave him in possession of hundreds of thousands of Ukrainians his goons can rape, mutilate, torture, and kill. Because, let's face it, we in the flaccid West are growing bored of this particular sensation and we want to move on to celebrity scandals. That's why diplomacy is always the best solution to any problem - provided, that is, the problem is someone else's and we don't have to suffer any consequences of note.