Chinese invasion of Tibet:
http://www.tibet.com/WhitePaper/white2.html
"http://www.savetibet.org/tibet/history/beforechinese.php
"........China's present claim to Tibet is based entirely on the influence that Mongol and Manchuk emperors exercised over Tibet in the thirteenth and eighteenth centuries, respectively.
As Genghis Khan's Mongol Empire expanded toward Europe in the west and China in the east in the thirteenth century, the Tibetan leaders of the Sakya school of Tibetan Buddhism concluded an agreement with the Mongol rulers in order to avoid the otherwise inevitable conquest of Tibet. They promised political allegiance and religious blessings and teachings in exchange for patronage and protection. The religious relationship became so important that when Kublai Khan conquered China and established the Yuan dynasty, he invited the Sakya Lama to become the Imperial Preceptor and supreme pontiff of his empire.
The relationship that developed and still exists today between the Mongols and Tibetans is a reflection of the close racial, cultural and especially religious affinity between the two Central Asian peoples. To claim that Tibet became a part of China because both countries were independently subjected to varying degrees of Mongol control, as the PRC does, is absurd. The Mongol Empire was a world empire; no evidence exists to indicate that the Mongols integrated the administration of China and Tibet or appended Tibet to China in any manner. It is like claiming that France should belong to England because both came under Roman domination, or that Burma became a part of India when the British Empire extended its authority over both territories.
This relatively brief period of foreign domination over Tibet occurred 700 years ago. Tibet broke away from the Yuan emperor before China regained its independence from the Mongols with the establishment of the native Ming dynasty. Not until the eighteenth century did Tibet once again come under a degree of foreign influence.
The Ming dynasty, which ruled China from I368 to I644, had few ties to and no authority over Tibet. On the other hand, the Manchus, who conquered China and established the Qing dynasty in the seventeenth century, embraced Tibetan Buddhism as the Mongols had and developed close ties with the Tibetans. The Dalai Lama, who had by then become the spiritual and temporal ruler of Tibet, agreed to become the spiritual guide of the Manchu emperor. He accepted patronage and protection in exchange. This "priest-patron" relationship, which the Dalai Lama also maintained with numerous Mongol Khans and Tibetan nobles, was the only formal tie that existed between the Tibetans and Manchus during the Qing dynasty. It did not, in itself, affect Tibet`s independence.
On the political level, some powerful Manchu emperors succeeded in exerting a degree of influence over Tibet. Thus, between I720 and I792 the Manchu emperors Kangxi, Yong Zhen and Qianlong sent imperial troops into Tibet four times to protect the Dalai Lama and the Tibetan people from foreign invasion or internal unrest. It was these expeditions that provided them with influence in Tibet. The emperor sent representatives to the Tibetan capital, Lhasa, some of whom successfully exercised their influence, in his name, over the Tibetan government, particularly with respect to the conduct of foreign relations. At the height of Manchu power, which lasted a few decades, the situation was not unlike that which can exist between a superpower and a neighboring satellite or protectorate. The subjection of a state to foreign influence and even intervention in foreign or domestic affairs, however significant this may be politically, does not in itself entail the legal extinction of that state. Consequently, although some Manchu emperors exerted considerable influence over Tibet, they did not thereby incorporate Tibet into their empire, much less China.
Manchu influence did not last for very long. It was entirely ineffective by the time the British briefly invaded Tibet in I904, and ceased entirely with the overthrow of the Qing dynasty in I9II, and its replacement in China by a native republican government. Whatever ties existed between the Dalai Lama and the Qing emperor were extinguished with the dissolution of the Manchu Empire.
1911 - 1950
From I911 to I950, Tibet successfully avoided undue foreign influence and behaved, in every respect, as a fully independent state. The I3th Dalai Lama emphasized his country's independent status externally, in formal communications to foreign rulers, and internally, by issuing a proclamation reaffirming Tibet's independence and by strengthening the country's defenses. Tibet remained neutral during the Second World War, despite strong pressure from China and its allies, Britain and the U.S.A. The Tibetan government maintained independent international relations with all neighboring countries, most of whom had diplomatic representatives in Lhasa.
The attitude of most foreign governments with whom Tibet maintained relations implied their recognition of Tibet's independent status. The British government bound itself not to recognize Chinese suzerainty or any other rights over Tibet unless China signed the draft Simla Convention of I9I4 with Britain and Tibet, which China never did. Nepal's recognition was confirmed by the Nepalese government in I949, in documents presented to the United Nations in support of that governments application for membership.
The turning point in Tibet's history came in I949, when the People's Liberation Army of the PRC first crossed into Tibet. After defeating the small Tibetan army, the Chinese government imposed the so-called "I7-Point Agreement for the Peaceful Liberation of Tibet" on the Tibetan government in May I951. Because it was signed under duress, the agreement was void under international law. The presence of 40,000 troops in Tibet, the threat of an immediate occupation of Lhasa and the prospect of the total obliteration of the Tibetan state left Tibetans little choice.
It should be noted that numerous countries made statements in the course of UN General Assembly debates following the invasion of Tibet that reflected their recognition of Tibet's independent status. Thus, for example, the delegate from the Philippines declared: "It is clear that on the eve of the invasion I950, Tibet was not under the rule of any foreign country." The delegate from Thailand reminded the assembly that the majority of states "refute the contention that Tibet is part of China." The US joined most other UN members in condemning the Chinese "aggression" and "invasion" of Tibet.
In the course of Tibet's 2,000-year history, the country came under a degree of foreign influence only for short periods of time in the thirteenth and eighteenth centuries. Few independent countries today can claim as impressive a record. As the ambassador for Ireland at the UN remarked during the General Assembly debates on the question of Tibet,"[f]or thousands of years, or for a couple of thousand years at any rate, [Tibet] was as free and as fully in control of its own affairs as any nation in this Assembly, and a thousand times more free to look after its own affairs than many of the nations here.".................."
http://www.savetibet.org/tibet/history/beforechinese.php
http://www.globalsecurity.org/military/world/war/tibet.htm
Chinese version:
http://www.index-china.com/index-english/Tibet-s.html
http://www.ccds.charlotte.nc.us/History/China/02/bishop/bishop.htm
BOOOOOOOOOOO!