Соответствующая норма
China
Practice Relating to Rule 37. Open Towns and Non-Defended Localities
China’s Law Governing the Trial of War Criminals (1946) provides that “deliberate bombing of non-defended areas” constitutes a war crime. 
China, Law Governing the Trial of War Criminals, 1946, Article 3(27).
During the Korean War, the Chinese Government blamed US forces for the bombardment of undefended areas. In a statement before the 18th International Conference of the Red Cross in Toronto in 1952, the head of the Chinese delegation denounced the fact that “undefended cities and villages were wantonly bombarded” and “a large number of peaceful civilians killed”. 
China, Statement of 30 July 1952 at the 18th International Conference of the Red Cross, Toronto, 26 July–7 August 1952, reprinted in Documents on Foreign Affairs of the People’s Republic of China, World Knowledge Press, Beijing, Vol. 2, pp. 82–83.
The Report on the Practice of China states that an occupying power shall not damage or destroy a city and its facilities in case of enemy withdrawal from the occupied territory, the reason being that the city is then, in fact, undefended. 
Report on the Practice of China, 1997, Chapter 1.8.