Règle correspondante
Practice Relating to Rule 65. Perfidy
Under Slovenia’s Penal Code (1994), if the killing of an enemy who has laid down arms or has surrendered at discretion, or has no longer any means of defence, is executed in a “perfidious way”, this constitutes an aggravating circumstance of the war crime. 
Slovenia, Penal Code, 1994, Article 379(2).