Why was the Brezhnev doctrine important?

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Tags

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2. #countries
3. #throughout
4. #parties
5. #region
6. #eastern
7. #promoting
8. #communist
9. #named
10. #party
11. #europe
12. #health
13. #responsible
14. #doctrine
15. #leonid
16. #brezhnev
17. #leader
18. #premier
19. #soviet
20. #stated
21. #until