The weakening of Tang Empire changed the fate of many tribes because Tang couldn't manage the conflicts among them. Uyghurs were at Mongolia at that time and made significant contributions in Tang's defeating of Turks. Western Turks fled West to Central Asia and asked for protection from Arabic Empire. Eastern Turks surrendered to Tang. Later the royal family got a Chinese surname Shi and got incorporated into Han Chinese. After the weakening of Tang Empire, many tribes started to fight each other. Uyghurs got defeated by Kyrgyz in Mongolia highland and lost the living spaces. Tang relocated Uyghurs to Southern Xinjiang and Gansu. At that time, they believed in Buddhism. In Gansu, you still could see Uyghurs believing in Buddhism which were called Yughur now.
The current so called Eastern Turkistan were introduced by Russia and Turks after Russia and China (Qing) started to compete each other in Xinjiang and Siberia. Actually Uyghurs were enemy of Eastern Turks and Eastern Turks were incorporated into Han Chinese.
^ china is doing in contested
North Korea is run by some 30 year old dictator who has the power to launch nuke, if he woke in the wrong side of the bed. South Korea & Japan deserves everything they can to protect themselves from total annihilation.
1) north korea has nukes and believe it, they will use when that 30 year old wakes up in the wrong side of the bed.. S.korea & Japan needs all the defense they can get their hands on. China has actually sanction north korea.. China should worry about N.korea instead of Thaad missiles places in S.korea.
2)S.vietnam is different from Japan, Philippines..
Philippines have a 100 year history with america. 220,000 U.S. citizens in the Philippines, 650,000 U.S. citizens visit the Philippines each year, estimate 4 million filipinos in america ( in US navy & american politics).. religion, cultural & political linkage...(in short )relationship run deeper than politics... most american's still remembers that philippines fought with america against japan in ww2...
on vietnam war, american policy was to stop the ''domino theory'' stopping spreading of communism. most american's didn't support the vietnam war from the beginning.. yes america lost the vietnam war politically but not military.
the only way america will leave asia if ''our allies want's ameirca out of asia''..
1st & most foremost america see's itself a pacific power, and we do see asia-pacific as our sphere of influence.
China and United States clearly have common grounds on Nukes. China wants to have nuclear free zone include Koreas and Japan as a nulcear buffer zone among China, Russia and USA.
The relation between China and North Korea is very and very complicated.
North Korea, different from South Korea was part of China until Tang Empire fell. Strategically North Korea is very and very important to China and treated as a gate to Beijing. For the last 1500 years, almost all dynasties fought a war over there, include PRC. Qing dynasty fought numerous wars with British, French and Russia. Even though China lost some wars, China was still safe until Japan tore China apart through North Korea. Japan and China had fought three major wars in North Korea during last 1500 years and Japan clearly knew Chinese weakness in North Korea. China is protected by Himalayas, Pamirs, Siberia and Pacific. North Korea is the only entry point to tear apart China.
After Tang empire fell, Korea remained Vassal state of China. Current North Korea is the only independent Korea in its whole history. To protect its independence, Chinese are not allowed for North Korea citizenship. Just in three years after Korean war, Kim I liquidated any Korean officials with careers in China or Soviet. Many of those Native Koreans had to go to China or Soviet. As you can see, North Korea is very mad at its independence. That's why China is very careful on it. It can go mad beyond nukes. The relation of China with Kim dynasty was not good even during Korean war.
The only solution for North Korea is for its party to overturn Kim dynasty. China can only wait because Kim family liquidate anyone with Chinese connection beyond regular business, including their own blood. China, not United States, is the biggest enemy of Kim dynasty. The situation is similar in Vietnam. Just Vietnam doesn't have a dynasty and is much more reasonable.
When China dominated East Asia, Korea and Vietnam were the most loyal. But now they dislike China the most because they want to protect their independence. As Vietnam's founder Ho Chi Minh said, if Chinese came, they could stay for 1000 years. That's the trouble for empires. The relation of Philippines to US is similar. When they treasure independence, they hate USA most; but when they are in trouble, you should be the first to help.
North Korea used to the land of Han Chinese. In Tang dynasty, the capital of North Korea Pyongyang was the capital of AnDong district. The capital of South Korea Seoul was called Han City in Chinese character and was changed only in 2005 to hide the fact. The river near the city is still called Han River. When Tang fell, they moved the border to Taedong River. In Ming dynasty, the border moved to the current Yalu river. The land was awarded to Koreans for their loyalty in Ming's wars with Mongols. North Korea is extremely nervous with China. Anyone with Chinese blood is denied citizenship and is treated as permanent residents with Chinese citizenship.