Соответствующая норма
Peru
Practice Relating to Rule 145. Reprisals
Peru’s IHL Manual (2004) states:
Reprisals consist of giving a warning (military action) or putting pressure on the enemy to force it to stop committing unlawful acts of war and respect international humanitarian law.
(1) Reprisals are a reaction to a violation of international humanitarian law committed by the enemy, the purpose of which is to put a stop to the violation. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 25.c.(1).
Peru’s IHL and Human Rights Manual (2010) states:
Reprisals consist of giving a warning (military action) or putting pressure on the enemy to force it to stop committing unlawful acts of war and to respect international humanitarian law.
(1) Reprisals are a reaction to a violation of international humanitarian law committed by the enemy, the purpose of which is to put a stop to the violation. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 29(c)(1), p. 234.
Peru’s IHL Manual (2004) states:
(3) Reprisals may only be taken as a last resort to enforce international humanitarian law and make the enemy comply with its provisions.
(4) A formal warning must be given to the enemy, notifying it of the action that will be taken if it continues to commit or repeats its violations of international humanitarian law. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 25.c.(3) and (4).
Peru’s IHL and Human Rights Manual (2010) states:
(3) Reprisals may only be taken as a last resort to enforce international humanitarian law and make the enemy comply with its provisions.
(4) A formal warning must be given to the enemy, notifying it of the action that will be taken if it continues to commit or repeats its violations of international humanitarian law. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 29(c)(3)–(4), p. 234.
Peru’s IHL Manual (2004) states with regard to reprisals: “The action taken must be proportional to the violation”. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 25.c.(5).
Peru’s IHL and Human Rights Manual (2010) states: “The action taken must be proportional to the violation”. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 29(c)(5), p. 234.
Peru’s IHL Manual (2004) states with regard to reprisals: “The action taken … must be discontinued once its purpose has been achieved, that is, when the violation of international humanitarian law by the enemy has ceased.” 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 25.c.(5).
Peru’s IHL and Human Rights Manual (2010) states: “The action taken … must be discontinued once its purpose has been achieved, that is, when the violation of international humanitarian law by the enemy has ceased.” 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 29(c)(5), p. 234.