Sigh, is that common? You just throw out a bunch of stuff into the room without knowing what you're talking about? Even Little Boy had 64kg of highly enriched

Sigh, is that common? You just throw out a bunch of stuff into the room without knowing what you're talking about? Even Little Boy had 64kg of highly enriched uranium. You can't just highly enrich uranium and have no one notice it. But EVEN IF you could. Delivering a nuclear warhead is a world of difference 1945 vs. 2021. Air defense systems are massively better, so you can't just fly to chinese airspace and have them not shoot you down. You can't just build a delivery system silently without testing it that penetrates chinas S-400 without problems. Yeah you can build something in your backyard and then where are you going to blow it up at? Japan can hardly keep chinese fishing boats out of their own waters.