Pakistan–Afghanistan Conflict: Why Former Allies Are Now Fighting Each Other
The Pakistan–Afghanistan conflict has exposed a major contradiction in South Asian geopolitics. Pakistan initially welcomed the Taliban’s return to power in Afghanistan in August 2021, expecting a government in Kabul that would be friendly to Islamabad. Five years later, the two sides are engaged in increasingly dangerous military confrontations, with airstrikes, border clashes, militant attacks and civilian casualties threatening regional stability.
The conflict is not simply a dispute between two neighbouring countries. It reflects decades of mistrust, competing security interests, disputes over their shared border and the consequences of Pakistan’s complicated relationship with militant organisations. For India, developments on this frontier matter because they affect regional terrorism, connectivity, Afghanistan’s political future and the wider security environment.
How former allies became adversaries
Pakistan supported elements of the Afghan Taliban during the decades of conflict that followed the Soviet withdrawal from Afghanistan. Islamabad hoped that a friendly government in Kabul would limit Indian influence and provide Pakistan with strategic depth against its principal regional rival.
When the Taliban overthrew the Afghan Republic in August 2021, Pakistan initially appeared to have gained a favourable strategic outcome. However, the new reality proved considerably more complicated.
The Afghan Taliban and Pakistan’s security establishment had shared interests during the insurgency against the US-backed Afghan government. But cooperation during a war does not necessarily translate into agreement over governing a country, controlling militant networks or managing an international border.
Pakistan subsequently experienced a resurgence of attacks attributed to the Tehrik-e-Taliban Pakistan, or TTP. Islamabad accuses the Afghan Taliban authorities of allowing TTP leaders and fighters to operate from Afghan territory. The Taliban government denies that Afghanistan is being used to threaten other countries.
The United Nations has documented concerns about the TTP’s presence and activities in Afghanistan, while also noting the difficulty of resolving the dispute. Historical ties between the Afghan Taliban and the TTP complicate efforts to persuade the former to act decisively against the latter. Source: UN Security Council monitoring report.
The TTP: Pakistan’s central security concern
The TTP, commonly called the Pakistani Taliban, is a militant organisation distinct from Afghanistan’s ruling Taliban movement. It seeks to overthrow Pakistan’s government and impose its own interpretation of Islamic rule.
Although the two organisations are separate, they share ideological affinities and historical connections. Their relationship has become a central source of tension between Islamabad and Kabul.
Pakistan argues that militant groups use Afghan territory as a sanctuary from which they plan and launch attacks inside Pakistan. It has demanded that the Afghan authorities dismantle these networks, surrender or expel wanted militants, and prevent cross-border infiltration.
The Afghan Taliban faces a difficult choice. Acting forcefully against the TTP could create internal divisions and provoke resistance from militants with longstanding relationships with the Afghan movement. Failing to act, however, leaves Pakistan convinced that its security concerns are being ignored.
Previous negotiations and temporary ceasefires have failed to produce a durable solution. The result is a recurring cycle: a militant attack in Pakistan, accusations against Afghanistan, retaliatory military action, and further deterioration in relations.
Pakistan also faces violence from separatist militants in Balochistan, including the Balochistan Liberation Army. These organisations have different objectives from the TTP and should not be treated as interchangeable. Nevertheless, Islamabad’s security establishment views militancy across its western regions as a serious national-security challenge.
The Durand Line: a border that remains politically sensitive
Another source of friction is the Durand Line, the boundary established between British India and Afghanistan in 1893. It now separates Pakistan from Afghanistan.
Successive Afghan governments have questioned the legitimacy of the boundary, while Pakistan regards it as its internationally recognised border. The line cuts through Pashtun communities whose social, tribal and family connections extend across both sides.
Pakistan has strengthened border fencing and tightened controls on movement. These measures are intended to prevent militant infiltration, but they have also disrupted trade and ordinary cross-border travel.
The dispute is therefore not exclusively about terrorism. It also involves sovereignty, border management, ethnic connections and the movement of people and goods.
For Pakistan, accepting uncontrolled movement across the border creates security risks. For Afghanistan’s rulers, Pakistani restrictions and military operations are matters of sovereignty and national dignity. Neither side has found a lasting political arrangement that reconciles these competing concerns.
From border clashes to direct military confrontation
Relations deteriorated sharply from October 2025, when Pakistani airstrikes and clashes with Afghan forces marked a major escalation. Temporary ceasefires and diplomatic initiatives failed to eliminate the underlying disagreements.
During 2026, the confrontation expanded further. Pakistan carried out strikes inside Afghanistan, claiming to target militant infrastructure. Afghan authorities condemned the operations and accused Pakistan of violating Afghan sovereignty.
On 1 October 2026, the United Nations Assistance Mission in Afghanistan (UNAMA) reported that Pakistani airstrikes in Kunar and Helmand had killed at least ten civilians, most of them children, and injured nine others. UNAMA also recorded civilian casualties from earlier cross-border attacks.
By October, the Council on Foreign Relations described the confrontation as the most direct military conflict between the two governments since the Taliban’s return to power. On 17 October, Pakistani forces and Afghan Taliban personnel exchanged fire in the Kurram border area.
These developments demonstrate the risks of treating airstrikes as a substitute for diplomacy. Even when a military operation is intended to target militants, civilian casualties and destruction of civilian infrastructure can deepen hostility, increase public anger and make negotiations more difficult.
The competing claims of Pakistan and Afghanistan must be assessed carefully. Pakistan’s assertion that a target houses militants does not, by itself, establish that every strike was lawful or that civilian harm was unavoidable. Equally, claims made by Afghan authorities about Pakistani intentions require independent verification. International humanitarian law obliges all parties to distinguish civilians from combatants and take precautions to minimise civilian harm.
Why the conflict matters to India
India has substantial interests in Afghanistan, including regional stability, humanitarian assistance, trade, development cooperation and preventing Afghan territory from being used by anti-India terrorist organisations.
New Delhi invested heavily in Afghanistan’s development before the Taliban takeover. Indian-supported projects included infrastructure, public institutions and assistance in healthcare and education. The change of government in Kabul disrupted India’s earlier diplomatic framework, but it did not eliminate India’s interests in the country.
India’s approach has gradually shifted towards pragmatic engagement with the Taliban authorities while maintaining important distinctions between functional cooperation and formal political recognition. An August 2026 analysis by the Indian Council of World Affairs describes this recalibration as driven by security, connectivity, humanitarian and regional considerations.
The Pakistan–Afghanistan conflict creates both opportunities and risks for India.
First, Pakistan’s worsening relationship with Kabul challenges the assumption that the Taliban’s return would automatically give Islamabad lasting strategic influence over Afghanistan.
Second, India can maintain diplomatic channels, provide humanitarian assistance and explore trade and connectivity projects without assuming that the Taliban has become an Indian ally.
Third, New Delhi must remain alert to the presence of anti-India militant networks. A government that has a difficult relationship with Pakistan is not automatically opposed to every organisation hostile to India, nor does diplomatic engagement guarantee security cooperation.
Finally, prolonged fighting can worsen Afghanistan’s humanitarian crisis, disrupt regional commerce and increase instability across South and Central Asia. India therefore has a direct interest in de-escalation, even when Pakistan’s regional difficulties create new diplomatic openings.
Can Pakistan and Afghanistan find a way out?
A lasting settlement requires more than another temporary ceasefire. Pakistan needs credible action against militant groups responsible for attacks on its territory. Afghanistan’s authorities need assurances that their sovereignty will be respected and that military operations will not become a permanent instrument of coercion.
A workable agreement would require verifiable commitments, intelligence-sharing arrangements, functioning border communication channels and independent investigation of serious incidents involving civilian casualties. Regional powers, including China, Qatar and other states with access to both sides, could support negotiations.
Both governments must also recognise that militant groups can undermine their interests even when those groups once served a strategic purpose. Allowing armed organisations to operate beyond effective state control creates long-term security problems that are difficult to contain.
Conclusion
The Pakistan–Afghanistan conflict is a reminder that military influence and political control do not automatically produce lasting security. Pakistan’s earlier support for the Afghan Taliban did not guarantee that Kabul would meet Islamabad’s security expectations. Meanwhile, the Afghan Taliban’s ability to govern Afghanistan has not removed the country’s vulnerabilities or resolved its difficult relationship with Pakistan.
For India, the appropriate response is neither to assume that the conflict automatically benefits New Delhi nor to ignore the strategic consequences. India should protect its security interests, maintain a clear position against cross-border terrorism, support humanitarian relief and encourage respect for sovereignty and civilian life.
Ultimately, the people who suffer most from this confrontation are often those with the least influence over it. A durable peace requires both governments to move beyond retaliation and address the security grievances that continue to drive the conflict.
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