evidence: High in the Himalayas, the holy town of Tawang is one of the most intractable issues in the border dispute between India and China - and a potential flashpoint for future conflict. [...] Of all the disputed areas, Tawang remains high up on China's list of claims. [...] "Tawang is indispensable to China. The Tibetan spiritual leader the sixth Dalai Lama was born there [in the 17th Century]," said Mr Zhou, who attended India-China border talks as a military expert in the mid-1990s.