The latest Defence White Paper issued on July 21, 2015, by Japan's Defence Ministry demanded that China top construction of a new offshore platform near the median line between China's coastline and that of Japan in the East China Sea. Confirming construction of the platform the White Paper entitled: 'Defense of Japan 2015', did not reveal the number of new platforms China is building, their size and location, or other details. However, on July 10, 2015, Japan's Defense Minister Gen Nakatani told a Diet session that China "could deploy a radar system on the platform and use it as an operating base for helicopters or drones conducting air patrols" over the East China Sea where Beijing asserts claim over the Japanese-administered Senkaku Islands.