This question has been closed, the reason given is that it is off-topic and "too story based".
Minimum nuclear weapons required for deterrent?
The meta question cited to justify this is as follows:
Why is my question "Too Story Based" and how do I get it opened?
However... I don't understand why this is off-topic if the cited logic from meta is:
"only the person who is developing a plotline can decide how characters will act or the plots will develop"
This is clearly more objective. There's multiple ways to answer it, and a lot of material which can be cited to justify this. In fact many comments and answers already have provided evidence to back their arguments.
"Capabilities of characters within a world...are on-topic, but questions must focus on what is possible-"
To me, the question seems perfectly within this logic, as it asks for capabilities about what is possible. I do not understand how this could be misconstrue to be about whether a nation should use their deterrent or something like that?