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''In the first-ever
joint declaration of Principles of Relations and Comprehensive Cooperation signed by Prime Minister Atal Bihari Vajpayee and his Chinese counterpart Wen Jiabao, India recognised that the Tibetan Autonomous Region is part of the territory of the People''s Republic of China.'
Are u unable to construe what the above highlighted parts mean?
The British had already signed a treaty ,along with the Russians ,that they would never invade Tibet, and acknowledged Chinese suzerainty over the region.
View attachment 804951
Your border agreement doesn't hold ground legally after the Chinese gov refused to sign it .
Here's the precedent British & Russian joint agreement signed with China regarding Tibet in 1907.
Article I. The two High Contracting Parties engage to respect the territorial integrity of Thibet and to abstain from all interference in the internal administration.
Article II. In conformity with the admitted principle of the suzerainty of China over Thibet,
Great Britain and Russia engage not to enter into negotiations with Thibet except through the intermediary of the Chinese Government. This engagement does not exclude the direct relations between British Commercial Agents and the Thibetan authorities provided for in Article V of the Convention between Great Britain and Thibet of the 7th September 1904, and confirmed by the Convention between Great Britain and China of the 27th April 1906; nor does it modify the engagements entered into by Great Britain and China in Article I of the said Convention of 1906.
^The British ,can't enter into any negotiation with Tibet except through the intermediary of Chinese gov. It would be illegal to do so without the consent of the Chinese gov.It would be like signing a border treaty with a region without its national gov's approval.