What are Russia's four main regions?

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Tags

1. #european
2. #northern
3. #northwestern
4. #north
5. #major
6. #volga
7. #regions
8. #eastern
9. #divided
10. #siberia
11. #physioeconomically
12. #western
13. #region
14. #caucasus
15. #conveniently
16. #federation
17. #central
18. #northwest
19. #russian