Confirmation of Kim Jong-un's visit follows speculation about a mystery green train used by high-ranking North Korean officials spotted by Japanese media in China.
During the four-day visit which came at the invitation of Xi Jinping, Kim held talks with the Chinese president who hosted a banquet to welcome the North Korean leader and his wife Ri Sol Ju, Xinhua said.
What are the implications of his visit to China?
Korean political commentator Jung-sik Seo analyses.
[Full analysis is available on audio news.]
