International law is a toothless tiger. It was "invented" by the West and is paid lip service by everyone else, who cite it when it suits their purposes and ignore it when it does not. Even the West ignores it when it actually applies to them, eg George W and Guantanamo. How many war criminals have been convicted from Western countries? The convictions have mostly, if not all, come from poor countries and limited to the losers, rather than the winners, of conflicts. In the past sixteen years since 9/11 the conviction rate for war crimes around the world has been so infinitesimally-low that the word has ceased to have meaning.
And don't talk to a Newfoundland fisherman about International Law. You'll get your ear talked off.