Sino-Vietnamese War

The Sino-Vietnamese War was a short-lived conflict (3 weeks and 6 days) in the early 1979 between China and Vietnam. This conflict was a response to the Vietnamese invasion and occupation of Cambodia led by China-backed Khmer Rouge. In february 1979 China under Deng Xiaoping launched a surprise invasion of northern Vietnam, capturing several cities near the borders. On March 6th 1979 China declared their mission successful, as they forced Vietnam to back some forces out of Cambodia to go protect Hanoi. However the Vietnamese occupation of Cambodia continued all the way into 1989 and Vietnam was able to oust Pol Pot out of Cambodia. Sino-Vietnamese relations weren't fully restored until 1991. China was trying to prove that USSR wasn't able to protect it's allies.