A predictable response from China. No surprise here. The benefit would be not that it could somehow persuade China but that it convincingly shattered hopes of those who vainly expected China's 'earnest' cooperation on this matter. I think we would no longer have misguided day-dreamers hampering decision-making process in Seoul and D.C.
Japan, Russia, and the United States all sent their ambassadors, it was an obvious slight.
China won't be leading the charge against NK.