Ashley J. Tellis at the Carnegie Endowment for International Peace:
Irrespective of how the coming security transition in Afghanistan pans out, one country is on a surprising course to a major strategic defeat: Pakistan. Every foreseeable ending to the Afghan war today—continued conflict with the Taliban, restoration of Taliban control in the southern and eastern provinces, or a nationwide civil war—portends nothing but serious perils for Islamabad. But judging from Pakistan’s behavior, it appears as if this fact has eluded the generals in Rawalpindi.
Ever since the Soviet invasion of Afghanistan, Pakistan has had one simple strategic goal on its western frontier: ensuring that Afghanistan remains a stable but subordinate entity deferential to Pakistan’s sensitivities on all matters of national security. Such deference was sought for a host of reasons. Islamabad wanted a guarantee that Kabul would not reignite the dispute over the countries’ common border (the Durand Line) and would not seek to mobilize the region’s Pashtun populations in support of either absorption into Afghanistan or the creation of a new nation. The Pakistani leadership also aimed to ensure that Afghanistan would not enter into close geopolitical affiliations with other, more powerful countries, such as the United States or India, in order to increase Kabul’s autonomy from Islamabad.
Amid the chaos that emerged after the Soviet withdrawal from Afghanistan, Pakistan settled on supporting the Afghan Taliban as its strategic instrument for securing Kabul’s compliance with its objectives.
More here.