Sino-Soviet border conflict, 45 years

The Sino-Soviet border conflict was a seven-month undeclared military conflict 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. The conflict resulted in a ceasefire, with a return to the status quo.