http://uk.reuters.com/article/2013/02/15/uk-korea-north-nuclear-idUKBRE91E0IP20130215

(Reuters) - North Korea has told its key ally, China, that it is prepared to stage one or even two more nuclear tests this year in an effort to force the United States into diplomatic talks with Pyongyang, said a source with direct knowledge of the message. 

Further tests could also be accompanied this year by another rocket launch, said the source who has direct access to the top levels of government in both Beijing and Pyongyang.