The armed forces of China are completely opposed to the Japanese government's move to "purchase" the Diaoyu Island and two of its adjacent islands, Chinese Defense Ministry Spokesman Geng Yansheng said Tuesday.

Geng issued a statement on the Japanese government's implementation of so-called "nationalization" of the Diaoyu Islands.

Despite strong opposition from the Chinese side, the Japanese government blatantly announced on Sept. 10 to "purchase" the Diaoyu Island and its affiliated Nan Xiaodao and Bei Xiaodao. This act is a severe infringment of Chinese territorial sovereignty, Geng said.

Geng said the Diaoyu Island and its affiliated islands are China's inherent territory. China has sufficient historical and jurisprudential evidence surrounding this.

Geng said the Japanese government's action and the so-called "island purchase" was totally illegal and invalid.

In the statement, Geng said since the start of the year, the Japanese government has endorsed right wing forces to clamor for the "island purchase" and even move in to "purchasing the islands" by itself. He said this severely harmed the general situation of the development in China-Japan relations.

Geng said in recent years, Japan has expanded armament under various excuses, frequently incurred tension in regional situations and repeatedly stirred up troubles on the issue of the Diaoyu islands. Such moves are worthy of high vigilance by its Asian neighbors and the international community.

"The Chinese government and armed forces stand firm and are unshakeable in its determination and will safeguard sovereignty over the nation's territories," Geng said.

"We are watching closely the evolution of the situation and reserve the right to take reciprocal measures," Geng said.