[quote]I hate thinking about nuclear threats, even though North Korea's threats are mostly dead threats.[/quote] Not so dead really. They've shown that they can construct and detonate devices in the dozen kiloton range (about the same yield as the WWII atomics). What they lack is an accurate ICBM or other surface-to-surface delivery system. But a delivery system is just that. It doesn't have to be a missile, it doesn't have to be a bomber. Put it into a container, load it on a ship, run it through a couple of ports and changes of shipping companies, and then bring it into Norfolk, Baltimore, or any other US port. Dial a cellphone detonator and.... well, there you go. Scary enough for you?