Yes, The Truman doctrine was a speech in March 1947, later an American Foreign Policy, in response to a crisis during the cold war to counter the Soviets geographical expansion. In the speech president, Truman pledged to contain the threats to Turkey and Greece. The U.S would support countries that would be threatened by the Soviet Communism by use of military support i.e, NATO an alliance that is in effect to date and financial aid to economies and military support to countries with political instability threatened by communism.