Kim Jong-il, North Korean leader is going to visit the China President Hu Jintao in Beijing.
The Presidents were going to meet for a summit on Monday.
It is China who plays the major role in settling down the row over North Korea's nuclear program.
Talks have made little progress on dismantling of the program.
"At the moment all parties are working together to find a way to set up a working group to address issues," Chinese Foreign Minister Li Zhaoxing told a news conference without confirming Mr. Kim's visit.
This trip was not reported by the North Korean information agencies. The two previous known trips of Kim Jong-il to China since 2000 were confirmed by the two governments only after he returned home.
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Mysterious North Korean Leader
Kim Jong-il, North Korean leader is going to visit the China President Hu Jintao in Beijing