evidence: History [edit]The 1860 Convention of Peking stipulated that the boundary between Russia and China lay along the Amur and Ussuri rivers. As such, the island at the confluence of the two rivers was Chinese. Until 2004, Bolshoy Ussuriyskiy Island was the site of a territorial dispute between mainland China and Russia. The Soviet Union forcefully occupied Bolshoy Ussuriyskiy and Yinlong Islands in 1929 in the wake of a Russo-Manchurian conflict, but this was not accepted by China. While Russia governed the islands as a part of Khabarovsk Krai, China claimed them as a part of Fuyuan County, Heilongjiang province, the easternmost part of China. [...] On October 14, 2004, the Complementary Agreement between the People's Republic of China and the Russian Federation on the Eastern Section of the China-Russia Boundary was signed, in which Russia agreed to relinquish control over Yinlong Island and around half of Bolshoy Ussuriysky. About 170 square kilometres of Bolshoy Ussuriysky was transferred to mainland China, while the rest remained under Russia's jurisdiction.[citation needed] In return, mainland China agreed to drop all territorial claims to the remainder of Bolshoy Ussuriysky kept by Russia and received the right to navigate ships along the main channel of the Amur.[citation needed]