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 … the use of poisonous gases, liquids and analogous substances.” 

At the First Conference of States Parties to the Chemical Weapons Convention in 1997, Lesotho made statements in support of the object and purpose of the 1993 Chemical Weapons Convention.