The last time Korea battled the Chinese army was in the 7th century. The only figures that even attempted to wage war against Korea were the ones that established a unified dynasty, not the warlords.it certainly had values in ancient times, those valuable things in Korea peninsular attracted all warlords in Japan and China, especially in war torn eras, hence the fighting over the control of peninsular.
Chinese and Japanese warlords never fought against each other.Women, the most valuable one, Ginseng, and mineral ore, even rice, etc are the basic reasons for Chinese and Japanese warlords fighting against each others.
And occupy China for itself. At least that was the plan.I remember Korea tried to liberate china from Manchua occupation after china was invaded by Manchu.
What are you smoking?Korea used the reign title of Ming崇祯 for more than 300 years to show their loyalty to Han Chinese.
We had Eastern Manchuria until the beginning of the 20th century.but I am wondering why it's isolated on a peninsula
The same reason China is divided into two.and was divided into two parts.