Errr... Largest tributory of Indus is Chenab. And it originates from HP. NOT Laddakh.
Oh Bhai, Chenab is itself a river and I am talking about Nubra not Himachal. Stay in Ladakh
They want salt water? Man that is more unbelivable claim.
I have a better explaination. They want to secure access to Tibet via Xinjiang and access to Chusul. Its not a water war.
They want all your J&K. For economic reasons, that's a better explanation.