CNN News:金正恩再次访华 与中国国家主席习近平举行会谈

Which of these countries shares part of China as eastern border? Thailand, Vietnam, India or North Korea. The only one of these countries located along an eastern border of China is North Korea.
Traveling by train, it takes about 13 hours to get from the Chinese capital of Beijing to the North Korean border and that's a journey that North Korean leader Kim Jong-Un started on Wednesday. He just wrapped up his third trip to Beijing within the past year and met with Chinese President Xi Jinping. Though a Chinese government spokesman said only that the two leaders were working toward upholding peace and stability on the Korean Peninsula.

A Chinese government run newspaper says the visit reflects the close relationship between North Korea and China. It also said it hopes this relationship can be accurately understood by South Korea and the U.S. who've been rivals of North Korea.