It was the subject of a territorial dispute between the Soviet Union and the PRC. Battles were fought over Zhenbao Island by the Soviet Union and the PRC, with a considerable loss of life, during the Sino-Soviet border conflict of March 1969. The conflict over Zhenbao raised concerns that it could ignite another World War until an initial resolution of the conflict in November 1969.
On May 19, 1991, the two sides came to an agreement that Zhenbao Island was part of the territory of the PRC, and in accordance therewith, the Soviet Troops withdrew.
A 2004 Russian documentary film, Damansky Island Year 1969. ("Остров Даманский. 1969 год"), was made about the 1969 Zhenbao incident. Interviews were filmed with participants and leaders from both sides of the conflict.
Centuries-old dispute became open combat during Cold War (archived webpage)
Geo Coords: 46°29'8.13"N, 133°50'40.04"E. Google Earth File