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Poland, with an imminent high-priced military ramp-up, is betting that the cost of peace is cheaper than the price of war with Russia. In a watershed defence spend, coming from a European Union loan, Warsaw is pouring nearly 44 billion euros ($71 billion) into stepping up its military infrastructure. Why now? That’s obvious for anyone following Moscow’s unyielding provocations. Jets scrambling to intercept Russian aircraft over the Baltic, cyberattacks on Polish railways and hospitals, and drones and missiles straying across its borders have all convinced Poland’s political class that...