Related Rule
Practice Relating to Rule 84. The Protection of Civilians and Civilian Objects from the Effects of Incendiary Weapons
In 1976, during discussions in the Ad Hoc Committee on Conventional Weapons established by the CDDH, Japan stated:
21. A consensus had been reached at the first session of the Conference of Government Experts that attacks in which incendiary weapons were used against cities with a concentration of civilians were indiscriminate and should be prohibited.
22. The working paper on incendiary weapons … submitted by eleven countries, including Japan, had been intended to start the prohibition or restriction of the use of such weapons from the point at which a minimum consensus had been reached, and had therefore been completely realistic. 
Japan, Statement at the CDDH, Official Records, Vol. XVI, CDDH/IV/SR.27, 19 May 1976, p. 278, §§ 21–22.
At the Preparatory Conference for the Convention on Certain Conventional Weapons in 1978, Japan declared that while it “was not sure it would be practicable to ban completely weapons of that kind [incendiaries] other than those which employed yellow phosphorus, it would be useful to prohibit their use in indiscriminate attacks on cities or populated areas”. 
Japan, Statement at the Preparatory Conference for the Convention on Certain Conventional Weapons, UN Doc. A/CONF.95/PREP.CONF./I/ SR.12, 12 September 1978, p. 2, § 3.