 Dulles also supervised the completion of the Japanese Peace Treaty, in which full independence was restored to Japan under United States terms.As Secretary of State, Dulles concentrated on building up the North Atlantic Treaty Organization and forming other alliances (a phenomenon described as his "Pactomania") as part of his strategy of controlling Soviet expansion by threatening massive retaliation in the event of a war.In the 1950s, he worked alongside people in Vietnam, and others, to reduce French influence in Vietnam as well as asking the United States to attempt to cooperate with the French in the aid of strengthening Diem's Army.