If I've heard correctly, he was babbling about nukes at some point recently. I dunno..., all I can tell you is what I'd do if I were Prez. People start talking nukes against the U.S., they move up on the list of people who might have a plane or automobile crash. I think it's time America started listening when people tell us they want to kill us. But I'm old fashioned that way.
Lots of people babble, and lots of people are full of hot air, but it doesn't mean they deserve a death penalty. Just think if we would have taken that approach with Russia back when Kruschev was pounding the table....that threat turned out to be hollow.