The Sino-Vietnamese War (also known by other names) was a brief conflict that occurred in early 1979 between China and Vietnam. China launched an offensive ostensibly in response to Vietnam's invasion and occupation of Cambodia in 1978, which ended the rule of the Chinese-backed Khmer Rouge. The conflict lasted for about a month, with China withdrawing its troops in March 1979.
In February 1979, Chinese forces launched a surprise invasion of northern Vietnam and quickly captured several cities near the border. On 6March of that year, China declared that its punitive mission had been accomplished. Chinese troops then withdrew from Vietnam. Vietnam continued to occupy Cambodia until 1989, suggesting that China failed to achieve one of its stated aims of dissuading Vietnam from involvement in Cambodia. China's operation at least forced Vietnam to withdraw the 2nd Corps, from the invasion forces of Cambodia to reinforce the defense of Hanoi.[13] Additionally, it demonstrated that the Soviet Union, its Cold War communist adversary, was unable to protect its Vietnamese ally.[14] The conflict had a lasting impact on the relationship between China and Vietnam, and diplomatic relations between the two countries were not fully restored until 1991, following the withdrawal of Vietnamese troops from Cambodia and the dissolution of the Soviet Union. The Sino-Vietnamese land border was formally agreed upon in 1999.
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