Borrell: NATO cannot depend on the mood of the U.S. President.

"Let’s be serious. NATO cannot be a menu-based alliance," Borrell said. He added that the United States would not protect NATO allies who do not meet the alliance's demands for defense from a hypothetical attack by Russia. "NATO is not a menu," he said. "It is an alliance of nations. It is not just a place for people to sit down and talk"