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  later in late August, it exploded an atomic bomb of its own, causing Americans grave national security concerns. Almost before the Truman administration could respond, it faced a new crisis in Korea. Limited War In Korea When North Korean forces invaded South Korea on June 25, 1950, in a surprise attack, they awakened the United States to the dangers of brushfire war in the nuclear age. The earlier crisis of 1948 in Berlin, Communist successes in Czechoslovakia in 1948 and China in 1949, and news of the Soviet explosion of an atomic device in 1949, had prompted the National Security Council (NSC) to issue a secret directive, NSC-68, in April 1950. It judged the Soviet Union to be bent on world domination. NSC-68 called for a massive increase in defense spending of 20 percent of the gross national product if necessary, the development of a hydrogen bomb, and the containment of Communism. The sustained American-led buildup of the North Atlantic Treaty Organization (NATO) in Europe was unmistakable evidence of containment, but Korea would be the first test of revitalized American resolve.  45