NO NO NO NO NO.
In response to NK's recent nuclear test against the Nuclear Non-Proliferation Treaty, the west is about to impose deeper economic sanctions. That cannot go without a response from the NK leadership. However, they have nothing but rhetoric with which to strike back.
Kim Jung Un is a man schooled in the west and well versed in western politics and democracy. He knows how to push the western media buttons to his own political ends.
He is doing just that by demonstrably flexing his muscles in a public display, not to threaten the west (not in any meaningful physical way), but as propaganda for consumption by his own people to justify continued expenditure of the majority of his countries resources on his military - even though it means his people go without.
The country is 50 - 70 years behind the rest of the world in terms of development. Control of the people has to be maintained through fear and intimidation. Kim knows that he must demonstrate his governments policies work to keep the population safe from the 'tyrannical western oppressors and puppet nations'. i.e. The U.S., South Korea and Japan.
A nuclear capability and sabre rattling is a way of demonstrating technological prowess, political strength and keeping the fabricated wolves from the door. Motivation for his people to continue in ignorance and not question what they are told.
After WWII, the US and the west developed a policy of 'no first strike' with regards to nukes.
That policy has held true for the last 70 years and it won't change because democracy won't allow it to. It's true, the US president could potentially order a first strike but then it would have to go through the services for it to be executed and that's where it will stop because questions will be asked and the president better demonstrate a clear, present and compelling danger and the backing of a lot of people or it won't happen.
If a state such as NK were to strike first they know they would be 'erased' within hours.
China increasingly views the NK leadership as an embarrassment and a thorn in it's side. Kim Jung Un's actions will only serve to strengthen that perception. China has too much to lose as her economic interests are too intertwined with the west to threaten that stability. China knows that to take sides with NK in a potential nuclear war would be to risk Mutually Assured Destruction, destabilise her own internal affairs and economic prosperity with the threat of internal civil war and commotion, mass migrations and an overthrow of their whole government system. It's not a democracy, but is ever moving towards democracy. The political status quo cannot be maintained.
That would leave NK isolated without Allies and faced with total annihilation. In those circumstances China would broker talks and put immense pressure on NK. She would not sit on the fence or side with NK.
Indeed if things looked like it was getting out of hand, China has the option to take matters into her own hands and attack NK with conventional forces to annexe the rogue state, depose the existing NK leadership and impose her own leaders as heads of state.
Better that pragmatic (if costly) solution than risk a pointless global nuclear war.
There are always options other than that. In the meantime the war of words continues.
Move along now, nothing to see here.