What comes after the post-Wall world?

Open this photo in gallery: THE GLOBE AND MAIL. SOURCES: GETTY IMAGES Timothy Garton Ash is professor of European studies at the University of Oxford and senior fellow at the Hoover Institution, Stanford University. His most recent book, Homelands: A Personal History of Europe, is a finalist for this year's Lionel Gelber Prize. Vladimir Putin's full-scale invasion of Ukraine two years ago started the largest war in Europe since 1945. It also ended a distinct period of European and probably of world history. After what is conventionally called the postwar period, meaning after 1945, we have been through what I…