Соответствующая норма
Practice Relating to Rule 74. Chemical Weapons
In 1989, Portugal co-sponsored a draft resolution in the UN Commission on Human Rights which expressed “grave concern about reports of killing of unarmed Kurdish civilians, in particular by military attacks during 1988 using, inter alia, chemical weapons and causing mass exodus to neighbouring countries”. 
Portugal, Draft resolution on the situation of human rights in Iraq, UN Doc. E/CN.4/1989/L.82, 3 March 1989, § 2.