nokey on Nostr: Let’s say we want to solve for nuclear proliferation and eliminate this manmade ...

Let’s say we want to solve for nuclear proliferation and eliminate this manmade existential risk. What would have to be true?

Intercept? A way to cheaply reach the warhead before it is heading down to its target and disable it? Ideally immediately at launch?
Establish a registry for all rockets and deploy interception at whichever launch hasn’t been registered?

We would need to detect launches and have enough spread out interceptors. What would these look like?