Behind the scenes and on-camera, combustible personalities and shifting politics in the U.S. and Europe resulted in decisions on security that could echo for years - including reopening the debate on nuclear weapons.

European leaders have been working to support Ukraine and beef up their own defenses. But the blowup between President Trump and Ukraine’s president on Friday made those goals more urgent.

President Donald Trump said Europe made loans and the United States did not, but that’s not accurate. “Just so you understand, Europe is loaning the money to Ukraine. They get their money back.”