Has NATO been used?

Related questions

1. Who is in charge of NATO?
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3. Is Russia part of UN?
4. Is USA part of NATO?
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Tags

1. #september
2. #united
3. #north
4. #enforcing
5. #attacks
6. #national
7. #invoked
8. #december
9. #unanimously
10. #member
11. #coalition
12. #atlantic
13. #states
14. #international
15. #security
16. #resolution
17. #peace
18. #force
19. #multi
20. #approved
21. #treaty
22. #afghanistan
23. #article
24. #council
25. #assistance