evidence: In particular, the border agreement includes a solution to a longstanding issue. Russia and China agreed to equally share territory of Bolshoi Ussuriisky and Tarabarov Islands (known as Heixiazi Dao in China) on the Amur River near Khabarovsk, and Bolshoi Island on Argun River. Russia and China had been struggling to find a mutually acceptable solution on these areas since 1991.