What does GRU mean in Russian?

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Tags

1. #which
2. #service
3. #version
4. #federation
5. #russian
6. #directorate
7. #foreign
8. #largest
9. #soviet
10. #russia
11. #union
12. #means
13. #military
14. #formerly
15. #english
16. #intelligence
17. #acronym
18. #agency