I can’t think of many groups of people more gullible than those who believe in a concept of “international laws”.
Right of the strongest? Follow the opinion of the warlord of the day? Follow our gut? Be so kind and bless us with your maxime that should guide the day in your opinion.
Sure many people are blindingly naive about the geopolitical realities involved, but that does mean only thinking about what is is sufficent. If we want to improve things there needs to be some ruler to measure the conduct of nations.