With brokering, it's hard to say. This is not a new problem, but it's a new set of controls. The Arms Trade Treaty, which made brokering a regulated act, at least for ATT-state parties, only recently celebrated its 10th anniversary since entering into force. This is relatively new stuff. At this time, I wouldn't be able to point to a gold standard.
On June 8th, 2023. See this statement in context.