The Taliban were largely founded by Pakistan's Inter-Services Intelligence (ISI) in 1994.
The ISI used the Taliban to establish a regime in Afghanistan which would be favourable to Pakistan, as they were trying to gain strategic depth. Since the creation of the Taliban, the ISI and the Pakistani military have given financial, logistical and military support.
According to Pakistani Afghanistan expert Ahmed Rashid, "between 1994 and 1999, an estimated 80,000 to 100,000 Pakistanis trained and fought in Afghanistan" on the side of the Taliban. Peter Tomsen stated that up until 9/11 Pakistani military and ISI officers along with thousands of regular Pakistani armed forces personnel had been involved in the fighting in Afghanistan.
In 2001 alone, according to several international sources, 28,000-30,000 Pakistani nationals, 14,000-15,000 Afghan Taliban and 2,000-3,000 Al Qaeda militants were fighting against anti-Taliban forces in Afghanistan as a roughly 45,000 strong military force. Pakistani President Pervez Musharraf – then as Chief of Army Staff – was responsible for sending thousands of Pakistanis to fight alongside the Taliban and Bin Laden against the forces of Ahmad Shah Massoud. Of the estimated 28,000 Pakistani nationals fighting in Afghanistan, 8,000 were militants recruited in madrassas filling regular Taliban ranks.
A 1998 document by the U.S. State Department confirms that "20–40 percent of [regular] Taliban soldiers are Pakistani." The document further states that the parents of those Pakistani nationals "know nothing regarding their child's military involvement with the Taliban until their bodies are brought back to Pakistan." According to the U.S. State Department report and reports by Human Rights Watch, the other Pakistani nationals fighting in Afghanistan were regular Pakistani soldiers especially from the Frontier Corps but also from the army providing direct combat support.
Human Rights Watch wrote in 2000:
Of all the foreign powers involved in efforts to sustain and manipulate the ongoing fighting [in Afghanistan], Pakistan is distinguished both by the sweep of its objectives and the scale of its efforts, which include soliciting funding for the Taliban, bankrolling Taliban operations, providing diplomatic support as the Taliban's virtual emissaries abroad, arranging training for Taliban fighters, recruiting skilled and unskilled manpower to serve in Taliban armies, planning and directing offensives, providing and facilitating shipments of ammunition and fuel, and ... directly providing combat support.
On August 1, 1997 the Taliban launched an attack on Sheberghan the main military base of Abdul Rashid Dostum. Dostum has said the reason the attack was successful was due to 1500 Pakistani commandos taking part and that the Pakistani air force also gave support.
In 1998, Iran accused Pakistan of sending its air force to bomb Mazar-i-Sharif in support of Taliban forces and directly accused Pakistani troops for "war crimes at Bamiyan". The same year Russia said, Pakistan was responsible for the "military expansion" of the Taliban in northern Afghanistan by sending large numbers of Pakistani troops some of whom had subsequently been taken as prisoners by the anti-Taliban United Front.
In 2000, the UN Security Council imposed an arms embargo against military support to the Taliban, with UN officials explicitly singling out Pakistan. The UN secretary-general implicitly criticized Pakistan for its military support and the Security Council stated it was "deeply distress[ed] over reports of involvement in the fighting, on the Taliban side, of thousands of non-Afghan nationals."[80] In July 2001, several countries including the United States, accused Pakistan of being "in violation of U.N. sanctions because of its military aid to the Taliban." The Taliban also obtained financial resources from Pakistan. In 1997 alone, after the capture of Kabul by the Taliban, Pakistan gave $30 million in aid and a further $10 million for government wages.
In 2000, British Intelligence reported that the ISI was taking an active role in several Al Qaeda training camps. The ISI helped with the construction of training camps for both the Taliban and Al Qaeda. From 1996 to 2001 the Al Qaeda of Osama Bin Laden and Ayman al-Zawahiri became a state within the Taliban state.[86] Bin Laden sent Arab and Central Asian Al-Qaeda militants to join the fight against the United Front among them his Brigade 055.
After the 9/11 attacks, Pakistan claimed to have ended its support to the Taliban. But with the fall of Kabul to anti-Taliban forces in November 2001, ISI forces worked with and helped Taliban militias who were in full retreat. In November 2001, Taliban, Al-Qaeda combatants and ISI operatives were safely evacuated from Kunduz on Pakistan Army cargo aircraft to Pakistan Air Force bases in Chitral and Gilgit in Pakistan's Northern Areas in what has been dubbed the "Airlift of Evil" Former Pakistani president Pervez Musharraf wrote in his memoirs that Richard Armitage, the former US deputy secretary of state, said Pakistan would be "bombed back to the stone-age" if it continued to support the Taliban,[92][93][94][95] although Armitage has since denied using the "stone age" phrase.
The role of the Pakistani military has been described by international observers as well as by the anti-Taliban leader Ahmad Shah Massoud as a "creeping invasion". Yet the "creeping invasion" proved unable to defeat the severely outnumbered anti-Taliban forces.
Pakistan has been accused of continuing to support the Taliban since 9/11, an allegation Pakistan denies.