Right.
North Korea is too damn close to Russia and China for us to use nukes.
That said, this confrontation is going to come to a head soon. Trump, Mattis, and Tillerson are tightening the screws on Kim and there is no turning back.
Admiral Harris; ‘I Need High Power Options’
North Korea Will Fire a Nuclear Weapon
https://www.youtube.com/watch?v=1WgCB9ZqgiA
They stand close to this mental case as the mental case develops nukes, but ya can't use small tactical nukes against the mental case? We certainly can. Think again.