Open this photo in gallery: French President Emmanuel Macron, left, and German President Frank-Walter Steinmeier attend a ceremony to mark the 80th anniversary of the massacre of 643 persons by Nazi German forces, in Oradour-sur-Glane, France, on June 10.Ludovic Marin/The Associated Press Timothy Garton Ash is professor of European studies at the University of Oxford and senior fellow at the Hoover Institution, Stanford University. A Europe that just celebrated the 80-year-old D-Day beginning of its liberation from war, nationalism and fascism now again faces fascism, nationalism and war. Please don’t be reassured by European Commission President Ursula von der Leyen’s...