Rattled by Russia’s invasion of Ukraine, Finland yesterday began a process that could lead to seeking NATO membership, a move that would infuriate Moscow. The assault on Ukraine sparked a dramatic U-turn in public and political opinion in Finland and Sweden regarding their long-held policies of military non-alignment. Attempting to join NATO would almost certainly be seen as a provocation by Moscow, for whom the alliance’s expansion on its borders has been a prime security grievance. A report commissioned by the Finnish government that was released yesterday examines the “fundamentally c...