China's relations with Vietnam began to deteriorate seriously in the mid-1970s. After Vietnam joined the Soviet-dominated Council for Mutual Economic Cooperation (Comecon) and signed the Treaty of Friendship and Cooperation with the Soviet Union in 1978, China branded Vietnam the "Cuba of the East" and called the treaty a military alliance. Incidents along the Sino-Vietnamese border increased in frequency and violence. In December 1978 Vietnam invaded Cambodia, quickly ousted the pro-Beijing Pol Pot regime, and overran the country.
China's twenty-nine-day incursion into Vietnam in February 1979 was a response to what China considered to be a collection of provocative actions and policies on Hanoi's part. These included Vietnamese intimacy with the Soviet Union, mistreatment of ethnic Chinese living in Vietnam, hegemonistic "imperial dreams" in Southeast Asia, and spurning of Beijing's attempt to repatriate Chinese residents of Vietnam to China.
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