The East China Sea .
Well obviously,its a civil war, so it was between china and china, so china. To answer your question
summer palace at shangdu, border between mongolia and china
China is a communist country. The cold war was between the western countries and the communist countries. China supported the communist countries.
To obtain Natural Resources that would strengthen the Japanese military
Japan.
The Himalayan mountain range forms a natural barrier between China and Mongolia.
The Himalays served as a natural barrier by separating China from India, so it does not face the monsoons India does. Instead it creates desserts, like the Gobi dessert, because of the traveling air.
yellow sea
It is the Himalayan Mountain Range that forms a natural barrier between China and India.
himilayan mountains
The Great Wall of China was built around 220-206 BC under Emperor Qin Shi Huang to protect the Northern boundaries of China.
It created a natural \barrier protecting it from the south
Lake Qinghai
Lake Qinghai
Immigration check point between Macau and Mainland China
There currently does not seem to be a large amount of trading exchange between the US and China in terms of Natural Resources. China currently uses US natural resources, but there is not much available for China to provide for the US.
Yes, the Himalayas do border the northeastern part of India. The mountain range forms a natural barrier between India and neighboring countries such as Bhutan, Nepal, and China (Tibet).