Соответствующая норма
Practice Relating to Rule 18. Assessment of the Effects of Attacks
According to the Report on the Practice of Iraq, the target should not induce the use of excessive force because the possible harm to civilians or undue damage to their possessions might exceed the specific military purpose. On the basis of a press conference given by the President of Iraq in 1980, the report considers that this means acting with only the degree of force necessary to achieve the specific military objective. The aim is to give due regard to humanitarian requirements and to lessen civilian suffering. 
Report on the Practice of Iraq, 1998, Chapter 1.5, referring to Press Conference of the President, 10 November 1980, Encyclopedia of the Iraqi-Iranian War, Vol. I, p. 318.