NATO’s response offers real-world evidence of how contemporary alliances work against external aggression against a close neighbour—Ukraine—not a member of NATO.


This article by Stephen M. Walt, writing for Foreign Affairs, makes the following points:
  • The Ukraine war has given NATO a new lease on life and shown the value of well-established procedures.
  • The invasion of Ukraine shows that leaders court disaster if they fail to understand how alliances form and work. 
  • The war also underscores the degree to which Europe remains dangerously dependent on the United States.


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