Southeast Asian leaders said a 1982 U.N. oceans treaty should be the basis of sovereign rights and entitlements in the South China Sea, in one of their strongest remarks opposing China’s claim to virtually the entire disputed waters on historical grounds. The leaders of the Association of Southeast Asian Nations took the position in a statement issued by Vietnam Saturday on behalf of the 10-nation bloc. ASEAN leaders held their annual summit by video on Friday, with the coronavirus pandemic and the long-raging territorial disputes high on the agenda.