As Russian Aggression Turns West, Poland Says It’s Ready

WARSAW—For more than a decade, Poland has prepared for the worst-case scenario: becoming the front line in a war between Russia and the West.

With an eye on growing Russian aggression in Europe, Warsaw’s military planners built out the country’s armed forces, turning it last year into the largest European military in the North Atlantic Treaty Organization. It ramped up military spending to 4.7% of gross domestic product this year—the highest in the alliance. A multibillion-dollar spending spree has put Poland among the biggest buyers of U.S. weapons.