NPR's David Greene talks to former Ambassador Douglas Lute, who served as the U.S. envoy to NATO from 2013 to 2017, on the challenges the 70-year-old military alliance faces.
NPR's David Greene talks to former Ambassador Douglas Lute, who served as the U.S. envoy to NATO from 2013 to 2017, on the challenges the 70-year-old military alliance faces.