evidence: 1. Diaoyu Islands have been China's inherent territory since ancient times. [...] China has forcefully stated its firm opposition to these Japanese infringements. Diplomatically, the Chinese government has made stern representations with the Japanese government and has taken strong countermeasures. Under pressure, the Japanese government made clear that it would "not support, encourage or acknowledge" the actions of right-wingers on Diaoyu Islands, promised to restrain them and prohibit them from landing on the islands. Legally, China has taken a number of measures to reaffirm its sovereignty over Diaoyu Islands. In February 1992, China issued the Law of the People's Repulic of China on the Territorial Sea and the Contiguous Zone, which reiterates China's territorial sovereignty over Diaoyu Islands in the form of legislation. On May 15, 2008, China sent a note to the Secretary-General of United Nations in opposition to Japan's depositing with the United Nations of a chart which marks its "territorial waters" around Diaoyu Islands. On March 3, 2012, China released standard names and descriptions of Diaoyu Island and its affiliated islands. On September 10, 2012, China released territorial baselines of Diaoyu Island and its affiliated islands.