[AdmSmith]

Rumint is that https://en.wikipedia.org/wiki/Jang_Song-thaek was working with the Chinese and info about it was disclosed by a country starting with R. That is why R is closer to KN than China, and why this happened: http://www.asahi.com/ajw/articles/AJ201708250037.html

[TigerLikesRooster]

It is more or less a common knowledge that Jang was in good terms with China.