They aren’t the first folks to sign or implement. It was signed in 1968, Ukraine wasn’t even a country then. And South Africa got rid of their nukes first.
So your whole question is false.
Allrighty then. I’ll change that one word.
You had sumthin to say when I didn’t answer YOUR question, so answer mine. You trust those tinhorn African dictators to do nukes right? No, you don’t. But that’s where you push the world if we don’t get nuke nonproliferation right with the [second] folks who signed and implemented such a treaty.
The choice is either to trust the USA and Russia, or trust the Idi Amins of this world.