CROATIA CRIMINAL CODE
SPECIAL PART
CHAPTER THIRTEEN (xiii) - CRIMINAL OFFENSES AGAINST VALUES PROTECTED BY INTERNATIONAL LAW
Article 161
(1) Whoever, in violation of the rules of international law, in time of war or armed conflict, kills or wounds an enemy who has laid down arms, or has surrendered at discretion, or has no longer any means of defense, shall be punished by imprisonment for not less than three years.
(2) If the killing referred to in paragraph 1 of this Article is committed in a particularly cruel or treacherous way, from greed or other base motives, or if several persons are killed, the perpetrator shall be punished by imprisonment for not less than ten years or by long-term imprisonment.
(3) Whoever, in violation of the rules of international law, in time of war or armed conflict, orders that in a battle there shall be no surviving members of the enemy or who engages in a battle against the enemy with the same objective shall be punished by imprisonment for not less than five years or by long-term imprisonment.
Denial of quarter - IAC
Denial of quarter - NIAC
Killing or wounding treacherously a combatant adversary - NIAC
Killing or wounding treacherously individuals belonging to the hostile nation or army - IAC
Murder - NIAC
Ordering
National penalties - war crimes
EDIT.