Now in its twelfth year, Russia’s war against Ukraine has become the longest major conflict in Europe since the Napoleonic era, leaving over one million Russian and half a million Ukrainian casualties, and more than $500 billion in destruction. Yet even when the fighting stops, peace may remain elusive. In this talk, Stephen Biegun explores what will follow the war’s end: the lasting damage to Russia’s global standing, the profound social and demographic consequences for Ukraine, and the enduring risks to European security. Finally, Biegun explores how the current administration’s stances on Europe and NATO might alter transatlantic responses to the war’s aftermath and Europe’s future stability. What might the “day after” look like—and how should Europe respond?