Соответствующая норма
Practice Relating to Rule 15. The Principle of Precautions in Attack
Kenya’s LOAC Manual (1997) states: “All possible precautionary measures must be taken to reduce the ‘collateral’ [damage] as much as possible.” 
Kenya, Law of Armed Conflict, Military Basic Course (ORS), 4 Précis, The School of Military Police, 1997, Précis No. 2, p. 3.