How secure was the USSR's control over Eastern Europe 1948-1989？

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Across
  1. 4. what is Germany Italy Japan and their all allies called during WW2
  2. 5. who is the prime minister after Stalin
  3. 9. who is the leader that was replaced after protests in Czechoslovakia
  4. 10. what is introduced to stop other countries resign from Warsaw Pact
  5. 11. how many tanks were moved into Budapest
  6. 12. which side of Berlin has a higher quality of life
  7. 14. the party that gain 57 percent of tge vote in Hungary
  8. 16. which group in Budapest demanded an end to soviet occupation during the uprising in Hungary
  9. 18. the period of reform in Czechoslovakia
  10. 19. did the government suspend solidarity on 13 Dec 1981
  11. 20. who is the new leader of Hungary that promised Nagy to leave the country safely
Down
  1. 1. what did Nagy announce that Hungary was going to leave
  2. 2. who died in 1953？
  3. 3. what did the strikers demand in 1980
  4. 6. what did Nagy ask Khrushchev to remove from Hungary
  5. 7. what is built in 1961？
  6. 8. which organisation did the Hungarians think will help them
  7. 13. who is the leader of the strike in Poland
  8. 15. what did the Czechoslovakian suffer throughout the 1960s
  9. 17. who is the Prime Minister that promise to continue reform in Hungary