By authorizing delivery of top-of-the-line battle tanks to Ukraine, German Chancellor Olaf Scholz set aside his evident reluctance — along with opposition within his own party and among many Germans — and joined other NATO allies in a deepening military and economic commitment to frontally challenge Vladimir Putin’s blood-soaked war. His decision, taken under pressure from NATO allies, was a smart, courageous reaffirmation of the West’s resolve to prevent a Russian victory and protect a basic precept of the international order: the impermissibility of wars of aggression.