European Union leaders agreed this week to a partial ban on Russian oil imports, overcoming a veto by Hungarian Prime Minister Viktor Orban. But the agreement commits only to banning seaborne imports to the EU by the end of 2022, leaving Russian oil imported by pipeline untouched. Seaborne imports account …

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 …