This is the relevant voluntary treaty: https://en.wikipedia.org/wiki/Treaty_on_the_Non-Proliferation_of_Nuclear_Weapons https://en.wikipedia.org/wiki/Treaty_on

This is the relevant voluntary treaty: https://en.wikipedia.org/wiki/Treaty_on_the_Non-Proliferation_of_Nuclear_Weapons https://en.wikipedia.org/wiki/Treaty_on_the_Non-Proliferatio... The treaty admits the US, Russia, UK, France and China to maintain nuclear weapons. Israel, India and Pakistan never agreed, and North Korea acceded. Some of those countries can deliver a nuke to anywhere on the planet in an hour. edit: added Israel to the list of non-signatories.