Some background on this question, I was trying to construct an international organisation whose main job is to patrol, investigate and protect its member countries from anomalous threats that have been regularly popping up. These threats can range from a simple humanoid abomination terrorizing a handful of people to an enormous eldritch abomination who could destroy entire cities.
My initial reasoning for it being an international organisation instead of just the individual countries enacting their own organisation is because some of these anomalies are capable of organizing themselves into a multinational threat which might necessitate cooperation between numerous countries within the region.
However I wonder if this could be rendered redundant by any simple changes within an existing government organisation or by simple cooperation between different government organisation.
So I ask you this is there any specific conditions that would necessitate an international organisation to form that patrols its member countries and cause them to work together in order to handle the occurrence of anomalous events?