The Communist world split in half, as China turned against the Soviet Union; Mao denounced Khrushchev for going soft on capitalism. However, the US failed to take advantage of this split until President Richard Nixon saw the opportunity in 1969. In 1958, the U.S. sent troops into Lebanon for nine months to stabilize a country on the verge of civil war. Between 1954 and 1961, Eisenhower dispatched large sums of economic and military aid and 695 military advisers to South Vietnam to stabilize the pro-western government under attack by insurgents. Eisenhower supported CIA efforts to undermine anti-American governments, which proved most successful in Iran and Guatemala.