It's not China's fault. It's North Korea's dick move. They initiated it. Their leader has direct responsibility for this. Don't blame others please. If North Korea reforms, I can hopefully expect a double figure growth rate for decades, just like what we have achieved. China really hopes they could change, but it's NK themselves who reject our offer.
If you deny any of China's control over or even influence of North Korea, then from now on the Chinese members have no reasons to blame US for anything our allies may do and have done for their own interests.
Observers and students of geopolitics do not take your protest seriously. When the US asked China to control NKR's nuclear weapons program, everyone knew that China exerted only a wee percentage of a tiny fraction of a thin slice of the influence that China have over NKR, notably China's greatest leverage, and if necessary weapon, is China being NKR's largest trading partner, so large that China might as well be NKR's sole trading partner. Everyone also know that when China publicly condemned NKR's nuclear weapons program, it would be meaningless behind closed doors for that partnership in the absence of China pulling that lever.
Subservient and supportive to geopolitics is geomilitary, as in the tactical array of forces to achieve strategic goals. Unlike the US, China is not protected continguously on land. The US have seriously faced a land adversary just once in its history -- Mexico -- and that was several generations of Americans and Mexicans ago. Canada never was any threat. And the US is protected by two large oceans that would require a peer military -- like the Soviet Union -- which would require an alliance -- like Cuba and the rest of the Americas -- in order to form a credible military threat. That is no longer true since 1991.
On the other hand, China have been under continuous hostile attitudes, if not outright threatened, from land based neighbors since post WW II to this day. Despite being in a Marxist alliance with the Soviet Union and assisted communist North Vietnam during the Cold War, relationships inside this alliance have been no less uncertain than any alliance in the West, perhaps even more uncertain in many ways.
Sino-Soviet split - Wikipedia, the free encyclopedia
The Sino-Soviet split (1960–1989) was the worsening of political and ideological relations between the People's Republic of China (PRC) and the Union of Soviet Socialist Republics (USSR) during the Cold War.
Now add in the sea based geomilitary alliance of the US, Japan, South Korea, the Philippines, and potentially Viet Nam, and China is essentially encircled.
China need a geopolitical and geomilitary buffer the way Mexico and Canada are to the US. The difference here is that neither Mexico nor Canada need any coercion or even persuasion
NOT to be threats to the US, while we can be confident that most people on this forum are smart enough to know that China, under her current leadership and moral world views, need to compel, not persuade, others not to be hostile, or at least reduce the level of hostility, to China. And given the recent belligerent behaviors by China towards neighbors, China will compel others to gravitate towards the US-led alliance that constitute that encirclement.
In sum, China needs a geopolitical and geomilitary bitch and North Korea is more of that bitch to China than Japan or South Korea will ever be to the US.