Japan is using a large coast guard drone, the SeaGuardian, to monitor the Senkaku Islands in the East China Sea amid repeated incursions into nearby waters by Chinese vessels, sources familiar with bilateral relations said Monday.The use of the MQ-9B SeaGuardian, a U.S.-made remotely piloted aircraft equipped with state-of-the-art radar, is expected to help beef up security in Japan's territorial waters off the uninhabited islets, encompassing a vast area of about 4,740 square kilometers.China Coast Guard ships regularly sail near the Senkakus, administered by Japan but claimed by China, wh…READ FULL ARTICLE