What was the Brezhnev Doctrine, which the Soviets announced in November 1968?

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The Brezhnev Doctrine was a policy that essentially stated the Soviet Union had the right to intervene in any socialist country if the leading role of the communist party was threatened. It was announced following the Soviet invasion of Czechoslovakia in 1968 to suppress the Prague Spring, a series of reform movements aiming for greater freedom and democracy within the country. This doctrine justified Soviet intervention in its satellite states to maintain strict control and prevent any deviation from orthodox Soviet socialism.

What Was the Brezhnev Doctrine, Which the Soviets Announced in November