Opinion: Putin's aggression should worry the US

Since the formation of NATO in 1949 the defense of Europe and the free world has depended on the absolute certainty that whatever president is occupying the White House, the United States will come to the aid of a NATO member if attacked. Any doubt about the American commitment, and the credibility of NATO's doctrine of collective defense, is holed below the waterline.

source CNN.com - RSS Channel - World http://ift.tt/2eB5xtW