In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center left, and Chinese President Xi Jinping, center right, attend a send-off ceremony at P...

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center left, and Chinese President Xi Jinping bid farewell at Pyongyang International Airpor...

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, right, and Chinese President Xi Jinping acknowledge welcoming people on a street in Pyongyan...

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center right, his wife Ri Sol Ju, right, Chinese President Xi Jinping, center left, and his ...

Chinese visitors look toward the North's side at the Imjingak Pavilion, near the demilitarized zone of Panmunjom, in Paju, South Korea. Chinese President Xi Jinping departed for a ...

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center left, his wife his wife Ri Sol Ju, left, Chinese President Xi Jinping and his wife Pe...

In this photo provided by the North Korean government, North Korean leader Kim Jong Un walks with his wife Ri Sol Ju at Pyongyang Station in Pyongyang, North Korea, before leaving ...

A sedan which is believed to carry North Korean leader Kim Jong Un leaves a train station with a convoy in Beijing, China. North Korean leader Kim Jong Un is making a four-day trip...