That looks like a very clear signal to me.
Be prepared.
They will probably try to detonate an EMP device to put the States in darkness for a few weeks or months.
The military has tempest-hardened electronics, so it’s a suicide move by the Norks, but they must be thinking they’ll get something out of it.
LLS
North Korea doesn't have the technology to do this. They don't have a reliable vehicle that can get here, and they can't yet put a nuclear tip on a missile anyway.
At this time there is virtually no chance your scenario could play out.
This is almost certainly just more bluster. North Korea is just trying to raise the temperature and sense of crisis, and in a few weeks they will claim the US and South Korea backed down. It's how this criminal government does internal politics.
They will probably try to detonate an EMP device to put the States in darkness for a few weeks or months.
More like years. It would take the surviving population decades to crawl back into the modern world.
A free opportunity to invade the mainland US on the backs of probably China and Russia.