TOKYO—Japan on Dec. 16 unveiled its biggest military buildup since World War II with a $320 billion plan that will buy missiles capable of striking China and ready it for sustained conflict, as regional tensions and Russia’s Ukraine invasion stoke war fears.
The sweeping, five-year plan, once unthinkable in pacifist Japan, will make the country the world’s third-biggest military spender after the United States and China, based on current budgets.