stop official interactions and contact of all kinds as well as the upgrading of substantive relations with the island， and handle Taiwan-related issues in a prudent and proper manner，澳门金沙官网，澳门金沙网址，澳门金沙网站 澳门金沙官网， and the one-China principle is the political foundation of the bilateral relationship. "The U.S. move is a serious breach of its commitments pledged on the Taiwan question， China's Foreign Ministry on Monday slammed the U.S. Health and Human Services Secretary Alex Azar's ongoing visit to Taiwan， and we have lodged stern representations with the U.S. side， so as not to seriously damage China-U.S. cooperation in major areas as well as peace and stability across the Taiwan Strait，澳门金沙官网，澳门金沙网址，澳门金沙网站 澳门金沙官网，" said Zhao. "We urge the U.S. side to abide by the one-China principle and the provisions of three China-U.S. joint communiques，澳门金沙网站 ，" Zhao added. ， as well as the upgrading of substantive relations with the island. The remarks were made by Foreign Ministry spokesperson Zhao Lijian while responding to a query about Azar's visit at a press briefing held in Beijing. "China is consistently and firmly opposed to the official interactions between the United States and Taiwan， urging Washington to stop official interactions and contact of all kinds，" Zhao said. The spokesperson reiterated that the Taiwan question is the most important and sensitive issue in China-U.S. relations，。