China and India don't have water treaty
Xigaze is closely located to Sikkim. From Xigaze, the Brahmaputra flows into Arunachal.
Guwahati: While there is no water-sharing treaty between the countries, India and China established an Expert Level Mechanism on trans-border rivers and in October 2013 the two governments signed a memorandum of understanding on strengthening cooperation on trans-border rivers under which Beijing provides data to India on the water flows.
The reports of blockade of the Brahmaputra tributary comes at a time of India’s reported decision to suspend talks with Pakistan under the Indus Water Treaty as part of its efforts to hit back at Pakistan in the aftermath of the Uri attack.
Some of the rivers under the Indus Water Treaty originate in China. Xinhua news agency quoted Zhang Yunbao, head of the project's administration bureau, as saying that the Lalho project on Xiabuqu river, a tributary of Yarlung Zangbo, in Xigaze in Tibet involves an investment of 4.95 bn yuan ($740 million).