Why did Pakistan support the Afghan Taliban historically?

Will the next phase of the Long War erupt inside a nuclear-armed state?

The Taliban, a monster Islamabad built but can’t control, is waging a war against Pakistan — and it shouldn’t surprise anyone. 

After decades of Islamabad playing both arsonist and firefighter — nurturing the Taliban, harboring al Qaeda, and weaponizing jihad against India — Bill Roggio and Tom Joscelyn reunite to dissect why the blaze is finally backfiring on Pakistan.