"Political conditions on the other side had also changed significantly as a result of the Sino-Soviet rupture. In the late 1950s, Mao, resentful of Moscow's refusal to support China's atomic weapons program, condemned Krushchev's abandonment of the doctrine of revolutionary warfare and his pursuit of peaceful coexistence. Krushchev, a critic of Mao's disastrous Great Leap Forward and belligerence toward his neighbors, in 1960 suddenly withdrew Soviet experts and reduced Soviet assistance to China. After the split became public at the Twenty-Second Party Congress in October 1961, Mao openly mocked Krushchev's retreat during the Cuban missile crisis, complained of Moscow's pro-New Delhi stance during the 1962 Sino-Indian border conflict, and denounced the test ban treaty as a means of preventing China from developing its own nuclear weapons. By the end of 1963 the two communist giants were openly competing for leadership of the revolutionary movements in Asia, Africa, and Latin America."