“Do you really think anything short of war will stop him?”
Maybe not. But seriously turning the screws on China economically has not really been tried yet, and it’s a better alternative than all out war.
All options on the table. Responses proportional to the offense. War should not be ruled out, but there is much that can be done before resorting to that option.
I just think you’re struggling for an excuse to avoid doing what needs to be done. You know if the idea is to get China to do something (which I think is a fools errand) then the most likely way to make that happen is to convince them that the next step is military. They won’t want a war in their backyard particularly one waged by the US. If sanctions on NK didn’t work then sanctions on China certainly won’t.