Gaf has a defense force for everything.
Criticising the United States isn't a defense of North Korea.
Truth be told, there's nothing more lazy than to say that "China just 'many sides!'d" when discussing the issue of North Korea and their military posturing, and ending that sentence with it being "absolutely unacceptable" is pretty ridiculous.
What we're talking about here is the potential for a war that could very well spiral into something far worse if diplomacy and de-escalation aren't put at the forefront. Obviously, these have limitations, but in order to understand what could provoke a response from North Korea you actually have to take a step back and actually attempt to understand it.
Regarding China, right now all we have is 'China needs to be doing more', 'this is their responsibilty' and so on and so on. On the surface there isn't anything wrong with this. I mean, we saw the loophole that China used in the last UN sanctions with the coal exports - but the issue here is this. After Kim Jong-il had died, the relationship between the two nations took a shift in direction. China has never wanted North Korea to aquire nuclear weapons, but at the same time they've also wanted the regime to be stable. With Kim Jong-un as leader, both of these have fallen by the wayside and this is concerning for all parties, including China. If China were to adopt harsher measures and slowly cut ties to an already strained relationship then that works in opposition to regional stability in the Korean peninsula. They don't want a war, they don't want a unstable and irrational North Korea and with the emegence of their nuclear weapons you can either push for diplomacy or you opt for brashness and posturing. Doing the latter to a regime that is failing will either result in a dramatic shift in policy from North Korea or it will result in war. This isn't even considering a first-strike scenario from the United States which undoubtedly would lead to a regional war.