EUROPE - World leaders with the power to make war but a duty to preserve peace solemnly marked the end of World War I’s slaughter 100 years ago at commemorations Sunday that drove home the message “never again” but also exposed the globe’s new political fault lines. As Donald Trump, Vladimir Putin and dozens of other heads of state and government listened in silence, French President Emmanuel Macron used the occasion, as its host, to sound a powerful and sobering warning about the fragility of peace and the dangers of nationalism and of nations that put themselves first, above the collective good. “The old demons are rising again, ready to complete their task of chaos and of death,” Macron said.