In 1942, after the United States entered in war against Japan and on the side of China, the Chinese government under the KMT renounced all treaties signed with Japan before that date and made Taiwan's return to China (as with Manchuria) one of the wartime objectives. In the Cairo Declaration of 1943, the Allied Powers declared the return of Taiwan to China as one of several Allied demands. In 1945, Japan unconditionally surrendered with signing of the instrument of surrender and ended its rule in Taiwan as the territory was put under the administrative control of the Republic of China government in 1945 by the United Nations Relief and Rehabilitation Administration. Per the provisions in Article 2 of San Francisco Peace Treaty, the Japanese formally renounced the territorial sovereignty of Taiwan and Penghu islands, and the treaty was signed in 1951 and came into force in 1952. As of the moment when the San Francisco Peace Treaty came into force, the political status of Taiwan and Penghu Islands were still uncertain until Republic of China and Japan signed Sino-Japanese Peace Treaty on April 28, 1952 in Taipei and the treaty came into force in August.