When you build all the technology needed to actually build a nuke, when you enrich uranium to near weapons-grade, but you never actually assemble the nuke, are you trying to building a nuke? Or are just messing with everyone, trying to make them think you're building a nuke when you're totally not building a nuke (pinkie promise)?

Either way, if you are threatening to annihilate another country, I wouldn't gamble on the latter.