China has been engaging in diplomatic pleasantries with North Korea (DPRK) this week in anticipation of the 65th anniversary of the latter, which falls tomorrow. There is currently a PRC delegation in Pyongyang (being headed up by Politburo Standing Committee member Zhou Yongkang), and the DPRK's embassy in Beijing has been hosting receptions to commemorate the event.
These various exchanges come within the context of the recent leadership changes in the Worker's Party of Korea, which have seen Kim Jong-un (one of Kim Jong-il's sons) promoted to senior party and military positions. The senior Kim had previously made a trip to China with the intention (it is widely speculated) of securing the CCP's backing for his 'keep it in the family' succession plan, in the face of likely opposition to Kim Jong-un from some of North Korea's generals when the handover is implemented.