By DARLENE SUPERVILLE and JILL COLVIN, Associated Press

PARIS (AP) For President Donald Trump in Paris, America First meant largely America alone.

At a weekend commemoration of the 100th anniversary of the end of World War I, the president who proudly declares himself a nationalist stood apart, even on a continent where his brand of populism is on the rise.

He began his visit with a tweet slamming the French presidents call for a European defense force, arrived at events alone and spent much of his trip out of sight in the American ambassadors residence in central Paris. On Sunday, he listened as he was lectured on the dangers of nationalist isolation, and then he headed home just as the inaugural Paris Peace Summit was getting underway.

Back at the White House on Monday, Trump tweeted that much was accomplished in his meetings, but voiced a familiar complaint about Americas allies. He said the U.S. pays billions protecting other countries, and we get nothing but Trade Deficits and Losses. He added: It is time that these very rich countries either pay the United States for its great military protection, or protect themselves.

His France trip made clear that, nearly two years after taking office, Trump has dramatically upended decades of American foreign policy posture, shaking allies. That includes French President Emmanuel Macron, who on Sunday warned that the ancient demons that caused World War I and millions of deaths were once again making headway.