Major world powers should abide by the terms of the Cairo Declaration, issued in 1943, in order to avoid confrontations in East Asia, observers said as they mark the 70th anniversary of the signing of the document.
The Cairo Declaration played a key role in charting international politics after World War II.
While urging Japan to obey the rules established by successive post-World War II documents, analysts also called on Washington to be consistent in its approach to building the world order in the postwar period and avoid pushing Japan into deeper regional confrontation.
On Dec 1, 1943, China, the United States and Britain issued the Cairo Declaration.
They agreed that "Japan shall be stripped of all the islands in the Pacific" it had seized or occupied since the beginning of World War I and "all the territories Japan has stolen from the Chinese, such as Manchuria, Formosa (Taiwan) and the Pescadores, shall be restored to the Republic of China".
The declaration also demanded Japan "be expelled from all other territories which she has taken by violence and greed".
It confirmed China's sovereignty over those territories stolen by Japan, including the Diaoyu Islands.
"The Japanese must comply with the Cairo Declaration, which is the fundamental source of a series of international laws," said Liu Jiangyong, deputy dean of the Institute of Modern International Relations at Tsinghua University.
Hu Dekun, head of the Institute for International Studies at Wuhan University, said the agreements made in a series of conferences in Cairo, Potsdam, Teheran and Yalta formed a complete legal system for postwar international relations.