A helicopter from a China Coast Guard ship violated Japanese airspace close to the Senkaku Islands in the East China Sea on Saturday, the Japanese Defense Ministry said, making it the fourth airspace intrusion by Beijing.The helicopter took off from one of the four Chinese coast guard ships that entered Japan's territorial waters around the Senkakus from around 12:20 p.m., the Japan Coast Guard said. The uninhabited islets are controlled by Japan but claimed by China, which calls them Diaoyu.Japan Coast Guard patrol vessels spotted the helicopter flying above the territorial waters for abou…READ FULL ARTICLE