Europeans will never understand the American people. Most Americans could not care less what they do. However most Americans do not want to sacrifice blood and treasure when they screw themselves up again. Nor do Americans wish to keep spending huge amounts of money in a largely outdated military alliance. American mothers have no interest in seeing their sons killed fighting to define the borders within the old Soviet Union. Times, cultures and political realities change.
Nicely put Al, you summed it up perfectly.