Which policy stated that the Soviet Union would intervene in Eastern Bloc countries to preserve socialism?

• A. Truman Doctrine
• B. Kennedy Doctrine
• C. Monroe Doctrine
• D. Brezhnev Doctrine

Answer: (D)

This question tests recognition of the policy that gave the Soviet Union a justification to intervene in its Eastern Bloc allies in order to preserve socialism. The Brezhnev Doctrine stated that if a socialist country faced internal collapse or threats from anti-socialist forces, the Soviet Union had the right to intervene to defend socialism in the entire bloc. This rationale underpinned actions like the 1968 invasion of Czechoslovakia, aiming to prevent reform movements from breaking the unity of the socialist system.

By contrast, the Truman Doctrine was about containing communism by supporting countries resisting subversion in places like Greece and Turkey; the Monroe Doctrine warned European powers against further colonization or interference in the Americas; and the Kennedy-era policies focused more on anti-communist posture during the broader Cold War period, not a formal doctrine justifying intervention to preserve socialism in Eastern Europe.