What language is closest to Russian?

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Tags

1. #former
2. #south
3. #bulgarian
4. #slovenian
5. #spoken
6. #belarusian
7. #slovakian
8. #languages
9. #ukrainian
10. #serbo
11. #russian
12. #polish
13. #croat
14. #slavic
15. #macedonian
16. #czech
17. #yugoslavia
18. #widely