Japan is "extremely concerned" about China's continued activities around a group of Japan-controlled, China-claimed islands in the East China Sea, the top government spokesman said Friday, ahead of the 10th anniversary of Tokyo putting most of the islets under state control.Chief Cabinet Secretary Hirokazu Matsuno told reporters the situation has remained "unpredictable" with Chinese coast guard vessels repeatedly entering Japan's territorial waters near the Senkaku Islands since September 2012.The Senkakus, which China calls Diaoyu, have been a thorny issue in bilateral ties since the Japa…READ FULL ARTICLE