Соответствующая норма
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
In 1990, in a letter addressed to the UN Secretary-General in the context of the Gulf War, Kuwait condemned the instructions given and measures taken by the Iraqi authorities, inter alia, “the execution of every Kuwaiti military man should he fail to surrender to Iraqi forces”. These were qualified as “savage practices”. 
Kuwait, Letter dated 24 September 1990 to the UN Secretary-General, UN Doc. S/21815, 24 September 1990.