In 1915 while Europe was engaged in a tribal war, butchering each other, some of their citizens put to paper what I can only call sarcasms.
It is the right of a people to rule themselves. And he who violates shall be the enemy of all.
Others had this declaration as a sacred principle
No province shall be transferred from one government to another without the consent by plebiscite of the population of such province.
Even though they were non state actors, I can only think that in referring to populations, they did not refer to Africans, Asians or any other group of people under colonial domination.