North Korean leader Kim Jong Un shakes hands with China's President Xi Jinping during Xi's visit in Pyongyang, North Korea, June 21, 2019. The world hopes North Korea and the United States can talk to each other and for those talks to be successful, Chinese President Xi Jinping told North Korean leader Kim Jong Un. KCNA via REUTERS

North Korean leader Kim Jong Un meets with China's President Xi Jinping during Xi's visit in Pyongyang, North Korea, June 21, 2019. Xi is visiting China's reclusive neighbour North Korea, seeking to bolster a longtime ally hit by U.N. sanctions over its nuclear and missile programmes. KCNA via REUTERS

North Korean leader Kim Jong Un meets with China's President Xi Jinping during Xi's visit in Pyongyang, North Korea, June 21, 2019. Xi, whose entourage includes the head of China's state economic planner, will be in North Korea for two days, the first Chinese leader to visit in 14 years, and could bring fresh support measures for its floundering, sanctions-bound economy. KCNA via REUTERS

Children present flowers to North Korean leader Kim Jong Un, his wife Ri Sol Ju, China's President Xi Jinping and his wife Peng Liyuan during Xi's visit in Pyongyang, North Korea, June 21, 2019. KCNA via REUTERS

North Korean leader Kim Jong Un, his wife Ri Sol Ju, China's President Xi Jinping and his wife Peng Liyuan attend a mass display during Xi's visit in Pyongyang, North Korea, June 21, 2019. KCNA via REUTERS

North Korean leader Kim Jong Un and Chinese President Xi Jinping attend a banquet in Pyongyang, North Korea, June 21, 2019. KCNA via REUTERS