containment (n.)

1650s, "action or fact of containing," from contain + -ment. As the word for an international policy of the West against the Soviet Union, it is recorded from 1947, associated with U.S. diplomat George F. Kennan, who in a "Foreign Affairs" article that year advising a policy of "a long-term, patient but firm and vigilant containment of Russian expansive tendencies."

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