Marie Harf vs Matt Lee on Ukraine

This is a paraphrase of the exchange not exactly what happened.

Lee:  So NATO is putting a rapid-reaction force in Ukraine.  Isn't that similar to what Russia is doing?
Harf:  Absolutely not.  They are two different things.  A rapid-reaction force is defensive.
Lee:  But Ukraine isn't a member of NATO, so the force isn't defensive.  Wouldn't Russia see it as provocative?
Harf:  You are buying into Russian propaganda.