(BBC News) "Our neighbor is a nut, a nut with a weapon."
That's how one irate Chinese social media user responded to North Korea's claims to have detonated a hydrogen bomb, in a location not too far from the border between the two historical allies. The comment is typical of a large swathe of recent Chinese internet postings.
The two countries are so close that this kind of comment isn't always tolerated by censors. At one time it would have been unthinkable for China to allow such open insulting criticism of Pyongyang.
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But this comment posted on Sina Weibo, China's equivalent of Twitter, by a user called kklpoo has remained uncensored and received more than 3000 likes.