Which policy declared that the Soviet Union would intervene in Eastern Bloc states to preserve socialism within the bloc?

• A. Truman Doctrine
• B. Brezhnev Doctrine
• C. Monroe Doctrine
• D. Domino Theory

Answer: (B)

During the Cold War, the Soviet Union asserted the right to intervene in other socialist states to preserve socialism within the Eastern Bloc. This policy, named after Leonid Brezhnev, was sparked by reforms in places like Czechoslovakia, where movements to liberalize challenged the unity of the bloc. It gave Moscow justification to use force to maintain Communist rule in allied states, most famously illustrated by the 1968 invasion of Czechoslovakia after the Prague Spring. It contrasts with the Truman Doctrine and Domino Theory, which are U.S. ideas about containing communism, and the Monroe Doctrine, which concerns the Western Hemisphere. So the policy described is the Brezhnev Doctrine.