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On a combative opening day of the NATO summit in Brussels, President Trump called other member countries \u201cdelinquent\u201d on military spending and attacked Germany as a \u201ccaptive\u201d of Russia. We examine where his frustration is coming from. Guest: David E. Sanger, a national security correspondent for The New York Times and the author of \u201cThe Perfect Weapon: War, Sabotage, and Fear in the Cyber Age.\u201d For more information on today\u2019s episode, visit nytimes.com/thedaily.