The Volga
Hitler's Treaty with the Soviets was made as a pretext for Germany to be able to invade Poland without starting an immediate war with the Soviet Union in 1939. This was explicitly so that Hitler could focus his forces westward and leave a marginal force to guard his Eastern Border. He most likely figured that he could overwhelm the Soviet Union after defeating France and the UK. These were all tactical reasons, they had nothing to do with an acquiescence to Communism.
The German Democratic Republic, otherwise known as East Germany, was a satellite of the Soviet Union in the aftermath of World War II. This lasted until the collapse of the Soviet bloc around 1989-1991.
Reagan's suspicion of the Soviet Union and its presumed activities around the world was tempered by a desire to leave some kind of legacy in arms control.
The Soviet Union did not "expel" countries it made them subservient to its ideologies by force. When countries tried to leave (eg Czechoslovakia) it sent in its tanks to put down the insurrection.
The Soviet Union would interfere in the affairs of another socialist country if SOCIALISM is at risk.
because they were economically very dependent on the soviet union
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The Soviet Union did not wait for Hitler to break the Treaty of Versailles. Ever since the Treaty of Rapallo (1922) Germany had been allowed to maintain a secret army of 100,000 men in the Soviet Union. These troops were ordered to leave in 1933, which they did. From 1935 till 1939 Communists (along with many others) favoured the formation of 'popular front', anti-Fascist coalitions of the kind that came to power in France and Spain. (Previously, most Communists had directed much of their hostility towards Social Democrats).
You should be aware the the Soviet Union ceased to exist in 1990 when all of its 16 constituent republics voted to secede from the USSR. So everybody was free from the Soviet Union once there no longer was a Soviet Union. As for the communist regime of Romania, that was overthrown by a general revolt. It was extremely unpopular.
Some wanted better job opportunities. There also was a constant threat of communist invasion from the former Soviet Union.
Russian did not leave the USSR. Rather, after the disastrous Soviet campaign in Afghanistan, satellites (Providences such as Georgia, Turkmenistan, Estonia, etc) started their own civil wars and pronounced themselves independent nations. After the Soviet Union collapse in 1991, almost every satellite was an independent country. Russian was one of those.
Texas leave the union in Texas