Another fair point.
That said, I don't think that's what he had in mind, nor do I think it's likely to happen in the time-frame that Jeremy Corbyn will be contesting elections. However, he's doing what our military leaders have always done, but particularly since the end of the Cold War - responding to politicians who don't play to their interests (ie, who threaten to cut defence) by saying that whatever is planned will cause us to be immediately invaded or nuked by the many foreign leaders who can't wait to get their hands on Buckingham Palace. Of course it's their job to look out for their own, and people in other branches of public service do it just as much, if not more - the NHS being a great example - but I do wish that people would look beyond their own little kingdoms a bit more.