Re: Shenzen, Shanghai, Beijing
The subs are to be nuclear powered, not nuclear armed. Which means they can stay at sea and underwater far longer than a diesel/electric sub can, but any warheads will be conventional chemical warheads. Which is all a hunter-killer sub (a sub designed to kill other subs) needs to do its job
And frankly, given the capabilities of modern technology, I'd''ve thought that even ballistic missiles with non-nuclear warheads (were such to be deployed) would give potential enemies pause for thought. They might not be capable of as much widespread indiscriminate devastation as nukes, but their capacity for localised targeted unpleasantness is quite good, and the threat to civilian populations, if used against them, ought to be enough to make any government think again about unnecessary warmongering.