India's nukes have always been pointed at Pakistan (and vice versa), not much need for range then. As for South Korea, it has little reason to suffer the reputation cost of obtaining nuclear weapons, especially with its alliance with the US (and, no, it doesn't need to match NK's nukes, the threat from the north is still a conventional artillery pointed at Seoul).
And I'm not sure if this'll spark a race, as I don't see many countries actually needing them. As an example, while Japan might lack nukes vs China, China can't credibly threaten to nuke Japan in any likely future disagreements/conflicts between the two.
Checking out seems not to do much.