Russia’s cruel war of aggression upon Ukraine must finally awaken the West from its post-Cold War slumber. This is merciless Putin’s war, waged against an innocent sovereign nation, but there will always be aggressors, and it is up to democracies to stop them before they are so emboldened and powerful that they threaten freedom itself. As U.K. Foreign Secretary Liz Truss put it in a recent speech, “For years now, Russia’s been building its capabilities, violating its commitments, and probing our weaknesses. … The free world must draw a line under a decade of drift.” While it is refreshing to hear a Western leader call out the West’s inertia, the sad reality is that the Russian threat is greater than Truss implies, and our “drift” in response to it should have ended long ago. So...