Соответствующая норма
Practice Relating to Rule 47. Attacks against Persons Hors de Combat
Section A. General
Ukraine’s IHL Manual (2004) states: “The following methods of warfare shall be prohibited: … killing or wounding of those who, having laid down their arms and possessing no means to protect themselves, have surrendered”. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, § 1.3.2.