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Yugoslavia, Socialist Federal Republic of
Practice Relating to Rule 65. Perfidy
Section B. Killing, injuring or capturing an adversary by resort to perfidy
The Socialist Federal Republic of Yugoslavia’s Military Manual (1988) states: “It is prohibited to kill or wound members of the enemy armed forces and enemy civilians by means of treachery.” 
Yugoslavia, Socialist Federal Republic of, Propisi o Primeri Pravila Medjunarodnog Ratnog Prava u Oruzanim Snagama SFRJ, PrU-2, Savezni Sekretarijat za Narodnu Odbranu (Pravna Uprava), 1988, § 104.
The manual adds that it is prohibited to put a price on someone’s head, whether State or military commander or any other person. 
Yugoslavia, Socialist Federal Republic of, Propisi o Primeri Pravila Medjunarodnog Ratnog Prava u Oruzanim Snagama SFRJ, PrU-2, Savezni Sekretarijat za Narodnu Odbranu (Pravna Uprava), 1988, § 106.
Under Socialist Federal Republic of Yugoslavia’s the Penal Code (1976), as amended in 2001, if the killing of an enemy who has laid down arms or has surrendered, or has no means of defence, has been committed in a “perfidious manner”, this constitutes an aggravating circumstance of the war crime. 
Yugoslavia, Socialist Federal Republic, Penal Code, 1976, as amended in 2001, Article 146(2).
Generally speaking, the Code provides that the use of a prohibited method of combat is a war crime, including the “perfidious killing or wounding of members of the enemy army”. 
Yugoslavia, Socialist Federal Republic, Penal Code, 1976, as amended in 2001, Article 148(1), including commentary.