The Soviet Union
Through 1944 that would be Germany, after that Russia controlled and held eastern Europe for decades.
Eastern europe
Because the Soviet Union controlled Eastern Europe for four decades. This changed when they elected a new leader, Mikhail Horbachev, he gave Eastern Europe more freedom as one of his reforms.
The southern part of Eastern Europe, or Southeastern Europe, is the most mountainous part of Eastern Europe.
The Soviet Union was the country that conquered most of eastern europe
Germany
Roman
they were controlled by the romans
Moscow is the most populated city in Eastern Europe and all of Europe.
roman
Nazi Germany
Russia contains the most eastern point on the continent of Europe.