The object of this article is to examine the role of insurance in international claims,and in particular the relationship of subrogation to the traditional rules of diplomatic protection and nationality of claims. Among the questions to be examined is that of locus standi of insurers in international claims (meaning in this context the standing of a state to present a claim of an insurer to an international tribunal, or to espouse it through diplomatic channels), the nationality of the insurers in relation to that of the insured, and the effect upon an international claim of payment by insurers possessing the nationality of State A to victims of an international wrong possessing the nationality of either State A or of State B. Can State C, which has caused the injury in circumstances involving its international responsibility towards State B, invoke the performance of the insurance contracts, in accordance with which the payments have been made, to deny its responsibility on the ground that the rules of nationality of claims have not been respected? If the insurers have covered the damage suffered in part only, would the quantum of the claim be affected&