If S.H.I.E.L.D. wasn't an international organization before aliens started invading, then it should be now. Claremont turned S.H.I.E.L.D. into an arm of the UN in 1990 in Uncanny X-Men when the Supreme headquarters Law International Enforcement Division became the Strategic hazard intervention espionage Logistics directorate... Then half way through Garth Ennis' Punisher Nick Fury meets Frank in a bar and says "Fuck the UN, lets get #### done." TV S.H.I.E.L.D. seems Americanicentric... It's headquarters and Schools seem to all be on American soil that even the Scotsmen have to board at, and I have not heard that many foreign accents at all other than the two principles, but if we are heading towards a World -Army in concept, then we are looking at assimilation of many working foreign organizations, that over night S.H.I.E.L.D. might just have to assimilate 10,000 Frenchmen as some spy organization from perhaps France folds under S.H.I.E.L.D's Umbrella as they inherit those resources and man power on all tiers of the Shield hierarchy. It's more than possible that eventually someone is going to join S.H.I.E.L.D. who outranks Fury, or will only join if Fury is subordinate to him or her and politically Fury has to comply.