Sino-Soviet border conflict
The Sino-Soviet border conflict was a seven-month undeclared military border war between the Soviet Union and China at the height of the Sino-Soviet split in 1969. The most serious of these border clashes, which brought the world's two largest communist states to the brink of war, occurred in March 1969 in the vicinity of Zhenbao (Damansky) Island on the Ussuri (Wusuli) River, near Manchuria.