Russia Great War and Superpower

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Across
  1. 5. City location of major conflict between Germany and USSR (10)
  2. 7. 98,000 of these lost during the war (10,5)
  3. 10. International organisation for Communist parties, set up in 1947 (9)
  4. 13. __________ states. Formally independent, but fell under USSR control. (9)
  5. 15. Developed in the 1930s. Ideal for USSR's wartime needs (7,7)
Down
  1. 1. Sent by US ambassador Kennan in 1946 to the US government. (4,8)
  2. 2. ________ massacre. Execution of Polish military members by the USSR in 1940. (5)
  3. 3. US economic aid given to the USSR from 1941 (4,5)
  4. 4. Location of oil fields Germany wanted to seize control of (8)
  5. 5. Gaining power in small steps via infiltration and working with other countries communist parties (6,7)
  6. 6. Leading general of the USSR (6)
  7. 8. US aid plan for Europe. Rejected by USSR. (8,4)
  8. 9. ________ states. Intended to separate Russia's borders from other countries (6)
  9. 11. Ally invasion of this country in 1943 alleviated pressure on Eastern Front (5)
  10. 12. Location of an uprising in
  11. 14. Economic organisation for Socialist states. Set up in 1949. (7)