Соответствующая норма
Kenya
Practice Relating to Rule 145. Reprisals
Section B. Reasonable notice and measure of last resort
Kenya’s LOAC Manual (1997) states that reprisals “can only be taken if … prior warning is given”. 
Kenya, Law of Armed Conflict, Military Basic Course (ORS), 4 Précis, The School of Military Police, 1997, Précis No. 4, p. 4.