The Truman Doctrine was part of containment. Under the Truman Doctrine the U.S. gave Greece and Turkey $400 million in economic aid to help these nations resist Communism or what President Truman called armed minorities or outside pressures.orea became divided along the 38th parallel with North Korea being supported by the Soviet Union and China while South Korea was supported by the United States and eventually the United Nations when North Korea invaded South Korea to start the War.