​Membership in the nuclear club is jealously guarded. The fewer the members the better. And the latest member to work his way in the door invariably calls for the gates now to be locked behind him; no new members after me. 
 
There are good reasons for this. One is the world perceives that the less nukes around, the better; they are less likely to get used and surely that’s good for everybody. But the more realistic reason for keeping the club tiny is that no nuclear state wants to yield up any more power to any other ambitious states in the world than absolutely necessary, to preserve their own monopoly. 
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And there is a theological issue among strategists about whether states going nuclear makes it more, or less likely that war will break out between them. So far, at least, that seems to be the case, even between the unstable nuclear states of Pakistan and India. But who knows what the future will bring?