He has a few nukes, and he has a few missiles. The problem is his nukes are low yield, don't fit on his missiles, and even if they did, his missiles are barely able to launch reliably, let alone hit anything on purpose.
Three US submarines could Tomahawk NK into oblivion in one strike, but he's got about a gadjillion artillery batteries locked in on Seoul and is guaranteed to get off some number of effective shots.
This is not acceptable in the current political environment.
A launch pad accident with a nuke could prove to be entertaining.
