Jean-François Bélanger is the assistant professor of Military Operations at the Royal Danish Defense College. Open this photo in gallery: French National Marine officers parade in front of a new nuclear submarine, in Cherbourg, France, in 2019. The only independent nuclear force in Europe is France. Former president Charles De Gaulle had insisted on it in the early years of NATO, believing he could not trust a future American leadership he had never met.LUDOVIC MARIN/AFP/Getty Images We are in the midst of the largest geopolitical realignment since the end of the Cold War. The United States, once a staunch ally,...