IMHO it doesn’t matter who drops one. The NORKS, Russians, or us.
Whenever the first one goes off, it’s lights out for 1st World pampering on the entire planet.
We’re not living in the 20th century anymore where our enemies will let it fly. There will be consequences either way I think. Again IMHO.
IMHO there are alternatives to dropping bombs. The Chinese have no restriction against assassination of heads of state as we do. I would not be surprised if they didn’t already have agents in place in North Korea’s military and government to handle things the way they want to be handled if there was a series of assassinations.