Diagnostic Misconceptions - USSR vs Eastern Europe

History: OCR A GCSE Cold War & International Relations, topic 1.2.18

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How did Stalin gain control the countries of Eastern Europe at the end of WW2?
Were the countries of Eastern Europe (such as Poland) ever officially a republic within the USSR?
How did Stalin bring Eastern European countries under the political control of the USSR?
What were the countries of Eastern Europe in relation to the Soviet Union?