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When the Taliban reformed as an insurgency, Mr. Baradar was Mullah Omar’s principal deputy, and he led the movement’s military operations. He oversaw a sharp escalation of the insurgency in 2006 but was also engaged in secret consultations with the emissaries of President Hamid Karzai and international assistance organizations.
He was detained in a joint U.S.-Pakistani raid in 2010, which Pakistani officials later said had been to end his dialogue with the Karzai government. Because of his respect within the Taliban and his previous openness to dialogue, however, the United States pressed Pakistan to release him so he could help …