The Taliban is a predominantly Pashtun, Islamic fundamentalist group that ruled Afghanistan from 1996 until 2001, when a U.S.-led invasion toppled the regime for providing refuge to al-Qaeda and Osama bin Laden. The Taliban regrouped across the border in Pakistan, where its central leadership, headed by Mullah Mohammed Omar, leads an insurgency against the Western-backed government in Kabul. Both the United States and Afghanistan have pursued a negotiated settlement with the Taliban, but talks have little momentum as international forces prepare to conclude combat operations in December 2014 and withdraw by the end of 2016.