How did Russia conquer Siberia?

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Tags

1. #borders
2. #expanded
3. #square
4. #conquest
5. #million
6. #became
7. #after
8. #whole
9. #pacific
10. #several
11. #eastern
12. #russians
13. #russia
14. #northern
15. #siberia
16. #larger
17. #known
18. #reached
19. #siberian
20. #kilometres
21. #ocean
22. #khanate