None needed
The article is repleat with error, as far as the use of HP bullets. As well as doing its best to sound like the anti-gun crowd of a few years back on the Black Talon bullet.
The Hague Convention on warfare
Declaration on the Use of Bullets Which Expand or Flatten Easily in the Human Body; July 29, 1899. Not the Geneva accords addresses HP/Soft Point ammo.
The us abides by it but never ratified it.