What language does Kievan Rus speak?

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Tags

1. #evolved
2. #states
3. #language
4. #languages
5. #ukrainian
6. #later
7. #centuries
8. #russian
9. #collapse
10. #slavic
11. #kievan
12. #during
13. #slavs
14. #belarusian
15. #after
16. #which