Every morning, residents of Dandong, in Northeast China's Liaoning province, stroll along the banks of the Yalu River. Across the water is Sinuiju, a city in the Democratic People's Republic of Korea, close enough to see apartment buildings and passing vehicles.

Are you familiar with China's largest border city? It's Dandong, located in Liaoning province. At first glance, it appears to be a quiet riverside town. However, once you cross…

Every morning, residents of Dandong, in Northeast China's Liaoning province, stroll along the banks of the Yalu River. Across the water is Sinuiju, a city in the Democratic…