It was a made-for-TV moment: The two leaders met on the tarmac at Joint Base Elmendorf–Richardson in Anchorage, Alaska, Air Force One and two F-35 fighters in the background. As they walked together, overhead came the roar of those F-35s, followed by the low, almost ghostly sweep of a B-2 stealth bomber — a display of U.S. airpower as much as a nod to the Cold War history between the nations. Hours later, after their...