Japanese Secretariat: “Confirmation of China’s claim of jurisdiction… Protest” Japan-Philippines maritime border demarcation negotiations sensitive Kyodo News: “Relations between the two countries may further deteriorate” Report A Chinese coast guard ship is navigating the South China Sea on the 15th. AFP Yonhap News Kyodo News reported on the 29th that it was confirmed that Chinese coast guard ships escorted Chinese maritime research vessels and official vessels while sailing in the exclusive economic zone (EEZ) south of Yonaguni Island, Okinawa Prefecture, the westernmost point of Japan, this month.