Philippines once stated Huangyan Dao was not Philippine territory

03:17 Historical documents and maps provide ample evidence of China's sovereignty over Huangyan Dao. Most notably, multiple official Philippine documents dating back to the 1990s explicitly acknowledged that Huangyan Dao lay outside the country's territorial boundaries. CGTN spoke to Chen Ping, the team leader of the Huangyan Dao Amateur Radio DX Expedition in the 1990s, to trace the story behind these Philippine documents.