What war is Battlefield 2 based on?

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Tags

1. #world
2. #between
3. #power
4. #resistance
5. #britain
6. #chechen
7. #union
8. #against
9. #russia
10. #fictional
11. #blocs
12. #united
13. #states
14. #groups
15. #insurgent
16. #various
17. #aided
18. #coalition
19. #during
20. #european
21. #middle
22. #china
23. #eastern