On the political level, some powerful Manchu emperors succeeded in exerting a degree of influence over Tibet. Thus, between 1720 and 1792 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 for a few decades, the situation was not unlike that which can exist between a superpower and a neighbouring 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 1904, and ceased entirely with the overthrow of the Qing Dynasty in 1911, 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.”