The European Union’s governing bodies could see a significant shake-up as millions of voters head to the polls across the twenty-seven-member bloc, with consequences for transatlantic ties.

Allies in Europe and the Asia-Pacific will be the beneficiaries of an overdue strategic realignment.

As a journalist, book author, and sometime adviser with frequent visits to Afghanistan between 2002 and 2015, I offer this distillation of lessons that we might learn from the United States’ longest …