Why did Russia attack Finland in 1939?

Related questions

1. Does Finland have any mountains?
2. Does it always snow in Finland?
3. How many trees are in Finland?
4. Are there forests in Finland?
5. How many migrants are there in Sweden?
6. Does Finland have many forest fires?
7. Does Finland have a lot of forests?
8. Who is the richest doctor in the world?
9. Does Finland have oil?
10. Do I need Ielts for Finland?

Tags

1. #world
2. #moscow
3. #refused
4. #three
5. #finland
6. #invaded
7. #march
8. #peace
9. #began
10. #invasion
11. #country
12. #later
13. #treaty
14. #soviet
15. #ended
16. #months
17. #november
18. #after
19. #outbreak