Most analyses of how to end the war in Ukraine focus on the intentions of one man: Russian President Vladimir Putin. This assumes that the person who single-handedly launched the invasion can also single-handedly stop it. But after more than four years of conflict, Russia’s economy and society have been reorganized around war, creating a powerful set of domestic incentives that makes ending the war difficult, and even dangerous, for Russia’s president. The Kremlin has made the war the central