How D-Day commemorations became the stage for diplomacy and geopolitics

To mark the 80th anniversary of the Normandy landings, French President Emmanuel Macron will preside over an international ceremony on Omaha Beach on June 6.  Every 10-year anniversary of D-Day has become a not-to-be-missed event for many heads of state. These commemorations have not always had a political and diplomatic dimension, but have acquired an international following over the decades.