evidence: The Russian Foreign Ministry has rejected China's apparent claim of ownership over a disputed island that has been a source of tension between Moscow and Beijing for decades. [...] The map touches on multiple territorial disputes, among them Bolshoi Ussuriysky Island, which sits at the confluence of the Ussuri and Amur rivers that separate Russia and China. The island is known as Heixiazi, or Black Bear, in Chinese. [...] The island has been split between Russian and Chinese control per the bilateral agreements. But China's newly published official map suggests it claims control of the entire 135-square-mile piece of land.