Соответствующая норма
Practice Relating to Rule 64. Conclusion of an Agreement to Suspend Combat with the Intention of Attacking by Surprise the Adversary Relying on It
In 1984, during the Iran–Iraq War, the two belligerents concluded an agreement under the auspices of the UN Secretary-General not to attack cities and villages. 
UN Secretary-General, Note verbale dated 26 June 1984 addressed to Member States and Observer States that are States parties to the Geneva Conventions of 1949, UN Doc. S/16648, 26 June 1984.
However, Iraq alleged in a letter to the UN Secretary-General that the Islamic Republic of Iran was using the agreement to concentrate armed forces in border towns. 
Iraq, Letter dated 28 June 1984 to the UN Secretary-General, UN Doc. S/16649, 28 June 1984.
According to the Report on the Practice of Iraq, in a military communiqué issued during the Iran–Iraq War, Iraq stated that it regarded as perfidious an attack on its defensive line after the Iranian armed forces had announced that their military operations had come to an end. 
Report on the Practice of Iraq, 1998, Chapter 2.4, referring to Military communiqué, 1 March 1987.