Chinese Ambassador to the U.S. Qin Gang has slammed U.S. House Speaker Nancy Pelosi's "reckless, provocative" visit to China's Taiwan region. "The speaker's visit is a major event upgrading the substantive relations between the U.S. and Taiwan, and sends a very wrong signal to 'Taiwan independence' separatist forces," the ambassador said in an interview with John King of CNN on Tuesday. "It is a serious violation of the one-China principle and the provisions in the three Sino-U.S. joint communiques. It deals a serious blow to the political foundation of China-U.S. relations, and seriously infringes on China's sovereignty and territorial integrity. This is a reckless, provocative move," Qin said.