In the 1950s and 1960s, the USSR controlled Eastern European nations via a number of methods, including
establishing puppet governments and using force to crush any dissent or opposition to communist rule.
establishing a blockade along the Iron Curtain and preventing anyone from entering or leaving those countries.
preventing those countries from joining the United Nations and creating a policy of containment.
encouraging opponents to leave those countries and establishing refugee organizations in Western Europe.

The USSR controlled Eastern European nations by establishing puppet governments and using force to crush any dissent or opposition to communist ideologies. Hence, option A is correct.

What is the significance of USSR?

USSR was the state that was in complete support to spread communist ideologies throughout the world, especially after the Second World War. US and its allies in Eastern Europe became its biggest rivals.

In order to keep the spread of communism alive, the USSR formed puppet governments that followed the orders of USSR authorities. Any country in the region that disobeyed was crushed by the forces, causing violence.

Hence, option A holds true regarding the USSR.

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