evidence: After treaties in 1991 and 2001 were not able to complete define the disputed border between the Russian Federation and the Republic of China, the two states were party to the Complementary Agreement between the People's Republic of China and the Russian Federation on the Eastern Section of the China–Russia Boundary in 2004. The disputed territories were islands at the confluence of the Amur and Ussuri Rivers. Possession of the two islands was significant for military control of the Amur region, as the Russian city of Khabarovsk is in close proximity to the disputed border. China wished for the boundary to be the channel north of the islands, resulting in China’s possession of Bolshoy Ussuriyski and Tarabarov Island. Russia insisted that, consistent with the 1860 Treaty of Beijing, the southern channel should make up the boundary, allowing for Russian possession of the islands.