Carnegie Europe is on the ground at the 2018 NATO summit in Brussels, offering readers exclusive access to the high-level discussions as they unfold.

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For the first time in NATO's history, the president of the United States doesn’t just seem to disagree with the Europeans on substance—he actually appears be willing to walk away from the alliance. Judy Dempsey sat down with Tomas Valášek, director of Carnegie Europe and a former ambassador to NATO, to discuss Donald Trump’s businesslike approach to foreign policy and where the West fits into the U.S. president’s worldview.