Related Rule
Practice Relating to Rule 145. Reprisals
Section C. Proportionality of reprisals
In its oral pleadings before the ICJ in the Nuclear Weapons case in 1995, Mexico stated: “In the opinion of my country the use of nuclear weapons in reprisal – or any other pretext – against a non-nuclear attack is contrary to the principle of proportionality.” 
Mexico, Oral pleadings before the ICJ, Nuclear Weapons case, CR 95/25, 3 November 1995, p. 51.