President Joe Biden on Thursday used the 80th anniversary of D-Day to warn against the spread of isolationism and to promise that the U.S. would “not walk away” from Ukraine. Speaking before a crowd of aging WWII veterans, many over 100 years old and wheelchair bound, Biden pointed to the beaches of Normandy, where he spoke, as “a powerful illustration of how alliances make us stronger. It was, he remarked, “a lesson that I pray Americans never forget.” Acknowledging that soon “the last...