Related Rule
Lesotho
Practice Relating to Rule 70. Weapons of a Nature to Cause Superfluous Injury or Unnecessary Suffering
In its written statement submitted to the ICJ in the Nuclear Weapons case in 1995, Lesotho stated:
Any use of nuclear weapons, even in self-defense, would violate international humanitarian law, including the Hague and Geneva Conventions, which prohibit as practices of war … causing unnecessary or aggravated suffering. 
Lesotho, Written statement submitted to the ICJ, Nuclear Weapons case, 20 June 1995, p. 2.