The Cairo Declaration of Dec. 1, 1943, is often cited as the legal foundation for the People’s Republic of China’s (PRC) and the Republic of China’s (ROC) claims to territorial sovereignty over Taiwan.
The declaration, in international law, was not a binding commitment, but a mere joint communique by then-US president Franklin Roosevelt, then-president Chiang Kai-shek (蔣介石) and then-British prime minister Winston Churchill, and was announced four days after the conclusion of the Cairo Conference on joint war plans.