North Korea's military provocations this year angered its ally China, but Beijing remains reluctant to tighten the screws on Pyongyang, the Ploughshares Fund grantee International Crisis Group (ICG) [2]said in a report [3]. China is more concerned about its neighbor's stability than its nuclear program and views the nuclear issue as mainly the responsibility of the U.S. Its greatest concerns are a possible military confrontation between North Korea and the U.S., regime collapse, a flood of hundreds of thousands of North Korean refugees into China or "precipitous reunification" with South Korea leading to a U.S. military presence north of the 38th parallel.
Links
[1] https://www.ploughshares.org/file/1242
[2] http://www.crisisgroup.org/home/
[3] http://www.crisisgroup.org/home/index.cfm?id=6370&l=1&m=1
[4] http://www.google.com/hostednews/afp/article/ALeqM5iwYzGrRhqGFx3FWw37pNYzavZRXg