Reports indicate that one of Russian President Vladimir Putin’s reasons for invading Ukraine was to prevent Ukraine from joining the North Atlantic Treaty Organization, a military alliance that the West had mostly forgotten about. If those reports are correct, Putin’s NATO calculations appear to be as flawed as his Ukrainian war calculations. Because, if anything, Putin’s war has led to an increased international focus on NATO, the alliance’s unification against a common enemy and to its programmatic resurgence and membership growth. This was all apparent at the NATO summit held last week in Madrid — attended by all 30 Allied...