GS Papers: GS2, GS3
What Happened
The declaration of "open war" between Pakistan and Afghanistan in late February 2026 — following Pakistan's air strikes on Kabul, Kandahar, and the Paktia border region — is the most dramatic rupture in Af-Pak relations in decades. But the conflict did not emerge suddenly. It is the culmination of a long history of contested borders, ethnic nationalism, competing state interests, and the unintended consequences of Pakistan's policy of using non-state armed groups as instruments of foreign policy.
Pakistan's Defence Minister Khawaja Muhammad Asif stated that "our cup of patience has overflowed," citing the persistent sheltering of the Tehrik-e-Taliban Pakistan (TTP) by the Afghan Taliban government. The Afghan Taliban, for its part, announced "large-scale offensive operations" along the Durand Line, framing Pakistan's strikes as violations of Afghan sovereignty. The two sides — once strategic partners — are now engaged in direct military hostilities, with Pakistan conducting strikes inside Afghan cities and the Taliban attacking Pakistani border posts.
This explainer traces the key fault lines that made the current conflict almost structurally inevitable.
Static Topic Bridges
1. The Durand Line — A Boundary Neither Side Fully Accepted
The root of Af-Pak tension is the Durand Line, drawn in 1893 by British India's Foreign Secretary Sir Mortimer Durand and Afghan Emir Abdur Rahman Khan. The line was intended to demarcate spheres of influence, but it cut through Pashtun tribal homelands, dividing communities that shared language, culture, and kinship ties. Afghanistan's Pashtun majority never accepted the line's legitimacy, and successive Afghan governments claimed the Pashtun-majority territories of Pakistan's Khyber-Pakhtunkhwa province and FATA (Federally Administered Tribal Areas, now merged into KP) as part of a rightful "Pashtunistan." When Pakistan inherited the Durand Line at independence in 1947, Afghanistan voted against Pakistan's admission to the United Nations — the only country to do so. This original act of non-recognition set the tone for seven decades of troubled relations.
The Taliban government, which itself draws its leadership from Pashtun communities, has never formally recognised the Durand Line as Afghanistan's permanent international boundary. The Taliban has actively demolished border fencing erected by Pakistan in recent years — an act Pakistan views as aggression but the Taliban frames as resistance to an illegitimate partition of Pashtun lands.
2. Pakistan's Strategic Depth Doctrine and the Taliban
Pakistan's military establishment developed the "strategic depth" doctrine in the 1980s, arguing that a pliant Afghan government was essential for Pakistan's strategic security vis-a-vis India. Under this logic, the ISI supported the Afghan mujahideen against the Soviet Union during the Soviet-Afghan War (1979-1989), then backed the Taliban's rise to power in the 1994-1996 civil war period. The Taliban captured Kabul in 1996 and established the Islamic Emirate of Afghanistan. Pakistan, Saudi Arabia, and the UAE were the only three countries to recognise the Taliban government.
After the US invaded Afghanistan post-9/11, Pakistan officially broke with the Taliban under US pressure — but maintained unofficial ISI contacts and provided sanctuary in Quetta (the so-called "Quetta Shura") and Peshawar. Pakistan calculated that the Taliban would eventually return to power and that maintaining these links would give Pakistan influence over a post-US Afghanistan. The Taliban's return in August 2021 initially seemed to vindicate this strategy. But the Taliban proved unwilling to be Pakistan's strategic client — and actively sheltered the TTP, which had declared war on the Pakistani state.
3. Tehrik-e-Taliban Pakistan (TTP) — The Breaking Point
The TTP, founded in 2007 as a coalition of Pakistani militant groups, is the central issue driving the current conflict. The TTP seeks to overthrow Pakistan's democratic and military establishment, impose its own interpretation of Islamic governance, and avenge Pakistani military operations in tribal areas. It shares ideological roots with the Afghan Taliban but is operationally distinct and is designated as a terrorist organisation by Pakistan, the US, and the UN.
The Afghan Taliban and TTP share ethnic (Pashtun), religious (Deobandi), and personal ties — Taliban commanders and TTP leaders trained together, fought together, and are intermarried. Despite Pakistani pressure, the Taliban government has refused to extradite TTP leaders, neutralise their camps, or even acknowledge the TTP as a terrorist group. TTP attacks inside Pakistan — particularly in Khyber-Pakhtunkhwa and Balochistan — increased by over 70% between 2022 and 2025. Pakistan's February 2026 air strikes, targeting TTP camps in Khost and Paktika, were the trigger for the Taliban's declaration of hostilities.
4. India's Historical Role and Current Interests
India's relationship with Afghanistan has historically been one of the key fault lines in the Pakistan-India rivalry. India invested heavily in Afghanistan post-2001: building the Salma Dam (Herat), the Afghan Parliament building (Kabul), the Zaranj-Delaram Highway connecting Afghanistan's Nimroz province to Iran, schools, hospitals, and scholarship programmes. These investments were explicitly intended to build goodwill with the Afghan government and population, and implicitly to maintain an Indian strategic presence on Pakistan's western flank — the strategic "encirclement" that Pakistan's strategic depth doctrine was designed to prevent.
The Taliban's return in 2021 interrupted India's developmental footprint, though India has cautiously re-engaged — reopening its embassy in Kabul. India's interest in the current Af-Pak conflict is primarily strategic: Pakistan being consumed by a two-front military crisis (Taliban on the west, LoC pressure on the east) reduces Islamabad's capacity to project pressure on India. India should also be vigilant about the potential for anti-India groups to use Afghan territory for planning or sanctuary, and about China using its mediating role in the conflict to deepen its regional dominance.
Key Facts & Data
- Durand Line: Drawn 1893; 2,640 km; separates Pakistan's Khyber-Pakhtunkhwa from Afghan provinces
- Afghanistan was the only country to vote against Pakistan's UN membership in 1947
- Soviet-Afghan War: 1979-1989; ISI/CIA jointly funded mujahideen; ~2 million Afghan deaths, 5+ million refugees
- Taliban first captured Kabul: September 1996; recognised only by Pakistan, Saudi Arabia, UAE
- Taliban returned to power: August 15, 2021, after 20-year US-led NATO presence
- TTP founded: 2007; designated terrorist organisation by Pakistan, US, UN
- Pakistan's Operation Righteous Fury (February 2026): Air and missile strikes on Kabul, Kandahar, Paktia
- TTP attacks in Pakistan increased ~70% between 2022 and 2025
- India's development investment in Afghanistan (pre-2021): Over USD 3 billion
- Zaranj-Delaram Highway: Built by India; links Afghanistan's Nimroz province to Iranian border — gives Afghanistan non-Pakistani access to seaports via Chabahar
- Quetta Shura: Taliban's command-in-exile based in Quetta, Pakistan, during US occupation period
- FATA (Federally Administered Tribal Areas): Merged into Khyber-Pakhtunkhwa in 2018; historically the zone most affected by Af-Pak insurgency