After 1947 the Cold War intensified. Both sides increased military spending and took measures to enhance their military presence around the world. Fueled by growing distrust, the Soviet Union and the United States engaged in inflammatory rhetoric that added to the danger the conflict posed to world peace. In 1950 the United States, in cooperation with the United Nations, sent troops to South Korea to turn back an invasion from the Communist North. Truman took advantage of Cold War hostilities to expand presidential power through increased military spending and the creation of a vast national intelligence network.