Japan.
Mongolia is the buffer state of Russia and China. Its north is enclosed by Russia then its east, west, and south by China.
North and South Korea
The country in question is North Korea.
Taiwan, part of the Chinese mainland, and the East China sea lie between the Philippines and North Korea.
the yalu river
North Korea. China likes it this way, which is why they prop up North Korea as a communist buffer state between themselves and U.S.-backed South Korea.
Mongolia is the buffer state of Russia and China. Its north is enclosed by Russia then its east, west, and south by China.
Korea was part of China until 1895. Traditionally, Korea thought China as a parent or big brother country, and China treated Korea as a son country. After 1945, It still continue between North Korea and China. For South Korea, China is two of main countries influencing South Korean politics with U.S.
Korea (both North and South) is between China and Japan.
China wants stability in North Korea to ensure that its neighbor does not collapse, which could lead to a flood of refugees and potentially pose a security threat. China also wants to maintain its influence over North Korea as a strategic buffer against the United States and its allies in the region. Additionally, China seeks to prevent the reunification of the Korean Peninsula under a pro-Western government, as it would diminish China's regional influence.
Mongolia, even though its role as a buffer is limited because Russia has a 3,645-kilometer long border with China in addition to a 3,485-kilometer long border with Mongolia. In other words, should China decide to invade Russia, or other way around, they could cross the vast border directly without having to go through Mongolia.
In china right between mongolia and north korea
Korea was a country settled by Chinese, so they were subject to mainland China. Korea gave tribute to China and China protect Korea from enemy such as Japan and Manchuria.
It is on the border between China and North Korea.
I could actually find the answer....But...From my hypothesis...China..and...North Korea
None. Ocean. But you are probably wanting North and South Korea.
North and South Korea