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we need permission from the US of A to fire the damn things
Is it literal, functional permission - like, they have to push a big red button as well as us to allow a launch, or a political thing, but they could technically be used.
I've read that in the event of nuclear event, one of the options is to allow the captain of the subs the option to make a judgement call on what to do - it doesn't make sense that he'd have to call people to get his missiles enabled.I don't know why I think you'd know this by the way!
I think that this is missing the point a little - we lease all the nukes from the USA, they have an (in munition terms) very short shelf-life so there's a constant service/update shuffle going on to maintain "in-date" war heads.
So it's not independent from that perspective.
Secondly, we need permission from the US of A to fire the damn things - and given that we'd likely be firing them at Putin does anyone think that that permission is likely to be given by Putins favourite leader?