None. Ocean. But you are probably wanting North and South Korea.
Korea (both North and South) is between China and Japan.
japan
Japan.
Korea is a buffer state between China and Japan. It has historically played a strategic role in balancing the influence of these two neighboring countries in the region.
Japan lies to the northeast of China, and Taiwan is directly east of China.
China is the closest country to Japan that starts with a c. South Korea and Russia are far closer to the main mass of Japan than mainland China, though there are some disputed areas between the two countries.
Japan
Japan has a better technology.
Japan's, China's, and others.
china and japan
no. but china is.
No, never.