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Italy
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
Italy’s IHL Manual (1991) provides that it is prohibited “to declare that no quarter will be given”. 
Italy, Manuale di diritto umanitario, Introduzione e Volume I, Usi e convenzioni di Guerra, SMD-G-014, Stato Maggiore della Difesa, I Reparto, Ufficio Addestramento e Regolamenti, Rome, 1991, Vol. I, § 8.
Italy’s Law of War Decree (1938), as amended in 1992, provides that it is prohibited “to declare that no quarter will be given”. 
Italy, Law of War Decree, 1938, as amended in 1992, Article 35.