SINOVIETNAMESE WAR
YEARS: 1985-1987 | DEATHS: 4000
The Sino–Vietnamese War or Third Indochina War was a brief but bloody border war fought in 1979 between the China and the Vietnam. China launched the offensive largely in response to Vietnam’s invasion and subsequent occupation of Cambodia, a war which ended the genocidal reign of PRC-backed Pol Pot’s Khmer Rouge. Chinese troops withdrew after a month-long incursion into northern Vietnam. Both sides claimed victory, though several authors have viewed the war as a Chinese failure.
Source: Wikipedia