William Dalrymple's 'A Deadly Triangle: Afghanistan, Pakistan & India' on Brookings is a must-read. http://bit.ly/14qy0HG
"The hostility between India and Pakistan lies at the heart of the current war in Afghanistan. Most observers in the West view the Afghanistan conflict as a battle between the U.S. and the NATO-led International Security Assistance Force (ISAF) on one hand, and al-Qaida and the Taliban on the other. In reality this has long since ceased to be the case. Instead our troops are now caught up in a complex war shaped by two pre-existing and overlapping conflicts: one local and internal, the other regional."