Related Rule
France
Practice Relating to Rule 65. Perfidy
Section E. Simulation of an intention to negotiate under the white flag of truce
France’s LOAC Summary Note (1992) prohibits perfidy and states: “It is forbidden to feign a protected status to invite the confidence of the enemy (abuse of … white flag).” 
France, Fiche de Synthèse sur les Règles Applicables dans les Conflits Armés, Note No. 432/DEF/EMA/OL.2/NP, Général de Corps d’Armée Voinot (pour l’Amiral Lanxade, Chef d’Etat-major des Armées), 1992, § 4.4.
The Summary Note also states that the “perfidious use of protected signs and signals” is a grave breach of the law of war and a war crime. 
France, Fiche de Synthèse sur les Règles Applicables dans les Conflits Armés, Note No. 432/DEF/EMA/OL.2/NP, Général de Corps d’Armée Voinot (pour l’Amiral Lanxade, Chef d’Etat-major des Armées), 1992, § 3.4.
France’s LOAC Teaching Note (2000) provides: “The recourse to perfidy is prohibited, notably the abuse of the white flag.” 
France, Fiche didactique relative au droit des conflits armés, Directive of the Ministry of Defence, 4 January 2000, annexed to the Directive No. 147 of the Ministry of Defence of 4 January 2000, p. 3.
France’s LOAC Manual (2001) states:
Using a protective sign in order to deceive the enemy and attain an operational goal constitutes an act of perfidy. In some cases, this may be a war crime. It is notably prohibited to feign an intention to negotiate under the cover of the flag of parlementaires. 
France, Manuel de droit des conflits armés, Ministère de la Défense, Direction des Affaires Juridiques, Sous-Direction du droit international humanitaire et du droit européen, Bureau du droit des conflits armés, 2001, p. 62.
Moreover, the manual states: “The perfidious use of any protective sign provided for by international law constitutes a war crime.” 
France, Manuel de droit des conflits armés, Ministère de la Défense, Direction des Affaires Juridiques, Sous-Direction du droit international humanitaire et du droit européen, Bureau du droit des conflits armés, 2001, p. 118; see also p. 115.
France’s Penal Code (1992), as amended in 2010, states in its section on war crimes related to international armed conflict: “Making improper use of the flag of truce … and thereby causing serious bodily harm to a combatant from the adverse party is a punishable offence.” 
France, Penal Code, 1992, as amended in 2010, Article 461-29.