Seems to me that China has a Really BIG interest in what NK does. Do they want to see incoming nukes on the border?
They either agree with NK or not.
Hopefully, they are against NK getting the capacity to attack. If they really are against it, then Kim will have a heart attack.
As much intrigue and drama as I've seen created by TPTB to gen up support for more war, and as much as NK looks like an ant stinging a giant, thinking it's gonna kill it and drag it home, only to find itself crushed between finger and thumb, I find the whole scenario implausible unless Kim is actually suicidal or diagnosed with a terminal illness.
I have not Seen anything, only reports.
And I've Seen reports that were used for starting wars, and the Reports were found to have been Lies.

I believe, NK & China, are a lot like,  ‘Little Johnny and his Mom’.

Mom:  ‘Johnny, we are going to Grams house in about a hour, but you can play in the sandbox with your trucks till we go’.

10 min later, mom, looks out the window, and her little Johnny, is playing with his trucks, splashing them trough a mud puddle.  
She sighs, knowing she will have to spend time to clean him up.
But she just lets him play a bit longer, before she calls him in, to clean him up.

China trades more with them then ever, they don't want any issues.  

Best regards,