If Estonia were invaded, that might not seem vital to the US, but it might seem very vital to Poland, Latvia, Romania, Finland, etc., who would all feel quite d

If Estonia were invaded, that might not seem vital to the US, but it might seem very vital to Poland, Latvia, Romania, Finland, etc., who would all feel quite directly threatened by such an event. They would all be immediately on the phone to Germany, France, and all the other NATO countries.