Political system
The Yalu River divides China and North Korea.
Russia. The distance between the island of Tsushima, Japan and the coast of Korea is an estimated 65 km (about 40 miles). The Soya Strait, which separates Sakhalin Island, Russia from Hokkaido, Japan is about 40 km wide (25 miles).
Water.
sea.
China, North Korea, and South Korea are all different countries.
The Sea of Japan
The East Sea.
The SOUTH CHINA SEA separates Vietnam from the Philippines.
The Korea Strait separates Japan and Korea. It connects the East China Sea to the Sea of Japan.
The Yellow sea seperates china and south korea
China and Russia to the north and South Korea to the (surprise!) south
The neighboring countries of North Korea are South Korea, China, Russia, Japan, and Mongolia.