The first time we try to do anything against someone with a submarine force it could get a bit interesting. That nice Mr Dinnerjacket has some and that fella Kim out east, plus Mr Mubarak bought some from the nice chinese man (even if they are knackered). Indonesia has some decent boats as well and funnily enough all of these are adjacent to maritime trade routes of some description. Longer memories will remember one of the contributors to the 70's oil crisis was closure of Suez.
Looks like it'll be down to someone else next time (potentially no bad thing), question is, who?