Pakistan-India Tensions Resurface After Rare Naval Collision in the Arabian Sea

A collision between a Pakistani and an Indian naval vessel in the Arabian Sea on September 15, 2026, has reopened a flashpoint in a relationship that had been relatively quiet since a US-brokered ceasefire took hold in May 2025.

What happened

The Pakistan Navy corvette PNS Hunain collided with the Indian Navy warship INS Kolkata in the north Arabian Sea, approximately 220 kilometers east of Oman. It's the first time since the May 2025 military clashes between the two countries that tension between their armed forces has surfaced in the open, rather than remaining confined to diplomatic statements.

India's Ministry of External Affairs summoned Pakistan's Chargé d'Affaires in New Delhi, Saad Ahmad Warraich, to formally protest what it called the "unacceptable and unprofessional conduct" of the Pakistani naval unit involved. New Delhi's formal complaint specifically alleged that the incident violated Article 10 of the 1991 bilateral agreement on advance notice of military exercises, maneuvers, and troop movements — a Cold War-era confidence-building measure between the two militaries.

The backdrop this sits against

A US-brokered ceasefire between India and Pakistan has held since May 2025, but the underlying relationship has remained far from settled. India's suspension of the Indus Waters Treaty in the aftermath of last year's clashes has become its own persistent flashpoint: Pakistan has warned that using water access as leverage could carry serious consequences for regional stability, and has pursued the dispute through international arbitration — a move India has publicly dismissed, with New Delhi's position being that Pakistan must first address India's concerns about cross-border terrorism before any treaty-related issue can be revisited.

Why a collision, specifically, matters

Naval incidents carry a distinct kind of risk compared with diplomatic disputes conducted through statements and summons: they involve military assets operating in close proximity, with limited room for miscommunication before an incident escalates beyond what either side intended. That two navies with a recent history of open clashes found themselves colliding — rather than the tension staying confined to treaty disputes and diplomatic protests — is itself a signal that the current ceasefire, while formally holding, hasn't fully de-escalated the operational posture between the two militaries.

What to watch

Neither government has indicated the incident will unravel the broader ceasefire, and formal diplomatic protest — rather than retaliatory action — has so far been the extent of the response. But the collision adds to a growing list of unresolved friction points between the two countries: the water-sharing dispute, the underlying terrorism allegations India cites, and now an unplanned naval encounter that could easily have gone differently.

Build Better Pakistan's Foreign Desk tracks India-Pakistan relations as part of our ongoing regional security coverage.