Chinese-United Kingdom relations (simplified Chinese: 中英关系; traditional Chinese: 中英關係; pinyin: Zhōng-Yīng guānxì), more commonly known as British–Chinese relations, Anglo-Chinese relations and Sino-British relations, refers to the interstate relations between China (with its various governments through history) and the United Kingdom. The United Kingdom and China were on opposing sides of the Cold War. Both countries are permanent members of the United Nations Security Council. The relationship between the two countries has deteriorated since the Hong Kong national security law was passed by China on 30 June 2020.