From the Times article
Yesterday’s decree amounts to an Argentine move to control all traffic from South America towards the islands,
All traffic? I can't see how the Argentinians can control anything outside their territorial waters without breaking the "Law of the Sea". The problem the RN might have is that destroyers and frigates are not designed for close contact of the "prepare to ram" variety, probably need to borrow some of those Icelandic "gunboats", are they available at a knock down price at the moment?