Russian President Vladimir Putin’s bellicose speech yesterday, in which he announced that Russia had recognized the independence of two separatist regions of Ukraine and would deploy military forces there as “peacekeepers,” suggests that after months of military posturing and diplomacy, a full-scale invasion may well be at hand. But while …

When the Soviet Union collapsed three decades ago, the European security architecture suddenly became uncertain, its future put in play. After all, much of the postwar balance of power in Europe—and the world—had rested on the icy pillars of the Cold War, pillars that in 1991 abruptly melted. It didn’t …

Not long after the commencement of Russia’s invasion of Ukraine, I wrote that for China, binding itself tightly to Moscow would do harm to Beijing’s long-term interests. That is because, I wrote, an alliance between a superpower like China and a far less dynamic country like Russia, whose economy is …