information:classification, stylistic:tone
1975–1993

In April 1975, the Khmer Rouge seized power in Cambodia, and in January 1976, Democratic Kampuchea was established. During the Cambodian genocide, the CCP was the main international patron of the Khmer Rouge, supplying "more than 15,000 military advisers" and most of its external aid. It is estimated that at least 90% of the foreign aid to Khmer Rouge came from China, with 1975 alone seeing US$ 1 billion in interest-free economic and military aid and US$20 million gift, which was "the biggest aid ever given to any one country by China". In June 1975, Pol Pot and other officials of Khmer Rouge met with Mao Zedong in Beijing, receiving Mao's approval and advice; in addition, Mao also taught Pot his "Theory of Continuing Revolution under the Dictatorship of the Proletariat" (无产阶级专政下继续革命理论). High-ranking CCP officials such as Zhang Chunqiao later visited Cambodia to offer help.

Democratic Kampuchea was overthrown by the Vietnamese army in January 1979, and the Khmer Rouge fled to Thailand. However, to counter the power of the Soviet Union and Vietnam, a group of countries including China, the United States, Thailand as well as some Western countries supported the Khmer Rouge-dominated Coalition Government of Democratic Kampuchea to continue holding Cambodia's seat in the United Nations, which was held until 1993, after the Cold War had ended. In 2009, China defended its past ties with previous Cambodian governments, including that of Democratic Kampuchea or Khmer Rouge, which at the time had a legal seat at the United Nations and foreign relations with more than 70 countries.