Poland’s ruling nationalist party issued a controversial demand for World War II compensation from Germany, saying destruction wrought by the Nazis caused damage worth about $1.3 trillion. The sum, equivalent to more than twice Poland’s annual economic output, returns the European neighbors to a debate over wartime repairs nearly eight decades after the war ended. While Polish officials have repeated the demand in various forms, Germany has maintained its financial obligations from the war are settled. The long-delayed report on wartime losses by the ruling Law & Justice party was unveiled Thursday in Warsaw on the 83rd anniversary of Adolf...