Donald Trump wants the war in Ukraine to end. Volodymyr Zelensky wants the war in Ukraine to end. Many other presidents and prime ministers want the war to end. Vladimir Putin is not one of those presidents. The war in Ukraine has become the political, psychological and economic center of Putin’s regime. That basic asymmetry would seem to doom any attempt at a negotiated peace — it is, in fact, the main reason no meaningful peace negotiations have occurred in the three and a half years since...