His comments came as Kim completed a secretive and unprecedented visit to Beijing on Wednesday as the two countries seek to repair frayed ties before Pyongyang's landmark summits with Washington and earlier with South Korea.
On his first trip abroad since taking power, Kim and his wife were greeted by an honour guard and a banquet hosted by President Xi Jinping, according to state media, which confirmed the three-day visit on Wednesday only after Kim had returned by train to North Korea.
The two men held talks at the Great Hall of the People and Kim pledged he was "committed to denuclearization" on the Korean peninsula, according to China's Xinhua news agency.
Kim also expressed willingness to hold the summits with Trump and South Korean President Moon Jae-in, it said.
Analysts said Xi likely wanted to see Kim in order to ensure North Korea does not cut a deal with Trump that hurts Chinese interests during their summit, expected to be held in May.
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