George F. Kennan, a U.S. diplomat in Moscow, sent a telegram to Washington that warned the Soviets were scared of the West and wanted to expand in Eastern Europe to create a "buffer zone" between Russia and the West. Kennan, using the pseudonym "X," wrote an article in the journal Foreign Affairs in July 1947 where he advocated what came to be called ________________________ as a way to counter "Russian expansive tendencies."
