The abode of Lord Shiva, Kailash Mansarovar is in Tibet. So it was definitely as part of India long long back. But the people settled in Tibet now are not Hindus and do not worship Lord Shiva. The place, like India, has been invaded a number of times and lost its original ethnicity and religion completely. A good part of the discredit in letting the place go away from Shiv Bhakts goes to the various Aryanist Vaishnavite Governments of India. The need of the hour is to elect original Indians, who have faith in lord Shiva and are dark in colour. Otherwise one can only hope that Lord Shiva will himself save his abode.