The Sino-Soviet split is the most consequential ideological rupture in the history of the communist movement. Between the late 1950s and the early 1970s, the two largest communist states in the world — the Soviet Union, with its empire in Eastern Europe, and the People’s Republic of China, with a fifth of humanity under its rule — moved from uneasy alliance to open hostility and near-war. The split destroyed the assumption that the communist bloc was monolithic, altered the strategic geometry of the Cold War, and produced the conditions for the 1972 Sino-American rapprochement.
The two states had been allies since 1949. The Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance, signed in Moscow on February 14, 1950, provided the diplomatic framework; the Korean War, beginning five months later, provided the first major test. Soviet material aid — industrial equipment, military advisors, blueprints for the first Chinese automobile factory — poured into China in the early 1950s. By 1956, however, the relationship had begun to sour, and by 1960 it was collapsing in public.
Lorenz Lüthi’s The Sino-Soviet Split (2008) remains the most thorough single-volume treatment. Lüthi shows that the rupture was overdetermined: ideology, national interest, border security, leadership personality — the structure of the international communist movement all pointed toward conflict. No single cause explains it, and no single decision by Stalin, Mao, or Khrushchev caused it.
Ideology
The ideological dispute centered on the path to communism. Mao argued, in speeches and policy experiments like the Great Leap Forward of 1958, that the Soviet model of heavy industrialization and gradual collectivization was too slow and had produced a bureaucratic caste. Khrushchev’s secret speech denouncing Stalin in February 1956, his doctrine of “peaceful coexistence” with the West, and his 1958 decision to cancel Soviet nuclear assistance to China convinced the Chinese leadership that the Soviet Union had lost its revolutionary nerve. The Russians, in turn, watched the Great Leap Forward produce the worst famine in modern history — somewhere between 15 and 45 million dead between 1958 and 1962 — and concluded that Mao was a dangerous dilettante.
The dispute was made worse by personal animosity. Mao believed that Khrushchev, a former mine foreman, was his inferior in both political theory and revolutionary commitment. Khrushchev believed that Mao was a peasant autocrat whose domestic experiments were a catastrophe and whose foreign policy was a series of reckless provocations.
National interest and the border
The Sino-Soviet border ran for thousands of kilometers, much of it along the Amur and Ussuri rivers and through the mountains of Central Asia. The treaties of the nineteenth century — the Treaty of Aigun in 1858, the Treaty of Peking in 1860, and the unequal series of protocols signed between 1860 and the 1880s — had left both sides with grievances. Stalin had used the Soviet presence in Xinjiang and Mongolia to extract concessions from the Chinese Communists while they were still fighting the civil war, and Mao had never forgotten.
The dispute was not publicly urgent until the late 1960s. By then, the ideological split had hardened into a strategic rivalry. In March 1969, Chinese and Soviet forces clashed at Zhenbao (Damansky) Island on the Ussuri River, in a series of small-unit engagements that left dozens of dead on both sides. The Soviet leadership considered a nuclear strike on Chinese nuclear facilities and reportedly sent a written warning through the U.S. State Department, asking the Americans to remain neutral. The Americans declined to give an answer, in part because Henry Kissinger had just begun the secret back-channel negotiations that would lead to the 1972 visit.
The public rupture
The public phase of the split began in 1960. In June, the Soviet Union withdrew 1,400 technical advisors from China and canceled 343 industrial projects, most of them in the heavy industrial sector that the Chinese had built around them. In 1961, both parties traded public attacks at their respective party congresses. In 1962, the Chinese criticized the Soviet handling of the Cuban Missile Crisis as opportunistic adventurism followed by cowardly retreat. In 1963 and 1964, both sides published open letters laying out the doctrinal case against the other. The Soviet Union signed a partial nuclear test ban treaty with the United States and Britain in 1963; the Chinese refused to sign and denounced the treaty as a Soviet-American conspiracy.
By 1966, the Cultural Revolution was in full swing, and Mao used the rhetoric of anti-Soviet revisionism to mobilize the Red Guards. The official Chinese press published the “Nine Commentaries on the Letter of the Central Committee of the CPSU” between 1963 and 1964, an almost biblical denunciation of Soviet “capitalist-roader” tendencies. Lüthi treats the Sino-Soviet split as the decisive intra-bloc event of the Cold War, more important to the communist world than anything happening in Europe.
The opening to the United States
The Sino-American rapprochement that began in 1971 had three causes. First, the Chinese needed a counterweight to the Soviet military buildup on their northern border, where Soviet forces had grown from about 15 divisions in 1960 to over 40 by 1970. Second, the United States needed a way out of Vietnam, and Beijing held the most important lever on Hanoi. Third, the two states shared an interest in checking Soviet expansion. Henry Kissinger flew to Beijing in July 1971 in secret. Mao met Nixon in February 1972. The Shanghai Communiqué of February 28, 1972 was a masterpiece of diplomatic ambiguity, in which the two sides agreed to disagree on Taiwan and to cooperate against “hegemony” — a Chinese code word for the Soviet Union.
Consequences
The Sino-Soviet split made the 1979 Soviet invasion of Afghanistan possible. Moscow’s reasoning was partly defensive: the loss of Egypt as a client in 1972 and of Somalia in 1977, combined with the warming Sino-American relationship, left Afghanistan as one of the few countries in the region where the Soviet Union could still project influence. A stable, friendly Afghanistan also gave Moscow leverage against Pakistan, which by the 1970s had become China’s closest military partner in South Asia.
The split also produced the Sino-Vietnamese War of February 1979. China attacked Vietnam within weeks of the Soviet-Afghan invasion, in part to punish Hanoi for its December 1978 invasion of Cambodia (which had toppled the Chinese-backed Khmer Rouge) and in part to demonstrate to Moscow that China would not be contained. By 1980, the Soviet Union was fighting an insurgency in Afghanistan and facing a hostile China on its southern border, with no serious ally in between.
Key sources
- Lorenz M. Lüthi, The Sino-Soviet Split: Cold War in the Communist World (Princeton, 2008)
- Odd Arne Westad, Decisive Encounters: The Chinese Civil War, 1946–1950 (Stanford, 2003)
- Chen Jian, Mao’s China and the Cold War (University of North Carolina Press, 2001)
- John Lewis Gaddis, The Cold War: A New History (Penguin, 2005)