Соответствующая норма
Mexico
Practice Relating to Rule 44. Due Regard for the Natural Environment in Military Operations
Section A. General
In its written statement submitted to the ICJ in the Nuclear Weapons (WHO) case in 1994, Mexico stated: “The threat or use of nuclear arms in an armed conflict would constitute a breach of principles of international environmental law generally accepted.” 
Mexico, Written statement submitted to the ICJ, Nuclear Weapons (WHO) case, 9 June 1994, pp. 10–11, §§ 35–41.