A close call between an Indian and Pakistani warship in the Arabian Sea has escalated into the most serious naval stand-off between the two nations in 12 years or more, with New Delhi closing ranks on a bitter dispute over who caused the collision on Friday brushing aside Islamabad's version of events as "diplomatic theatre.

Pakistan's reaction to India's protest was "the usual prevarication" New Delhi had expected and the government did not accept the claims, Director-General of External Affairs (DEA) Randhir Jaiswal said at his weekly press briefing. The observations were made two days after India summoned Pakistan charge d'affaires Saad Warraich to file a formal protest and hours after Islamabad followed suit, calling in India envoy Satyanjal Pandey with its own list of accusations.

In essence, the controversy is rather limited in its factual content but broad in its implications, having been stripped of all diplomatic verbiage. The Indian defence officials state that on Tuesday night, the INS Kolkata was performing a routine surveillance patrol over the north Arabian Sea when a Pakistani naval ship, dubbed as 'offshore patrol ship' PNS Hunain, began to overtake the vessel and carried out a "dangerous manoeuvre," tagged by Jaiswal as an "overtaking manoeuvre" that ended up in contact.

The new Delhi statement pointed out that the exercise was done within three nautical miles of each other, in violation of Article 10 of the 1991 confidence-building agreement between the two countries, and contravened international regulations for collision avoidance, which both countries are committed to as members of the UN convention on the law of the sea.

The Pakistan's side comes in a mirror image in the Foreign Office statement. Islamabad claims that the Kolkata had kept track of its own biennial SEASPARK-26 naval exercise, which has been underway since September 1, and had attempted to intrude into the drill zone several times over the past week before it moved out of the way on September 15 and caused the crash.

Pakistan terms the manoeuvre "belligerent" and also refers to the same 1991 pact for which New Delhi is claiming Pakistan had violated the requirement for 30 days' advance notification for military exercises near the border. Neither government has released radar tracks or AIS details or video, and neither government has officially stated on record what it was calling its own transport, leaving those outside with two conflicting stories and no third party method to resolve the issue.

The episode is more than one day's diplomatic duel, when and where it happened. It is the first direct clash between the military forces of Indians and Pakistan since the four-day air war in May 2025, which brought the two nuclear-armed neighbours to the brink of war for more than two decades. The recent incident of the Pakistani frigate PNS Babur nicking the Indian frigate INS Godavari in the Gulf of Aden during anti-piracy escort duty in June 2011, which was fortunately swept under the carpet after a few weeks, is the last similar occurrence in the region, analysts note, adding that both navies are now ready for confrontation unlike then.

A retired Pakistan Navy vice admiral has drawn parallels with Cold War era 'bumping' incidents between Soviet and American ships in the Black Sea, but with a caveat: while Washington and Moscow signed a bilateral Incidents at Sea agreement in 1972, and have a navy-to-navy hotline, India and Pakistan do not. Article 10 specifies the minimum distance but doesn't outline any manoeuvring procedures or joint mechanism to determine the cause of a collision once it has happened which is why each side blames the other with no umpire to be seen.

In the middle of that competitive ping pong game of who called whom is a hard economic story. The Arabian Sea is not a marginal water; it is one of the ways in which India imports most of its crude, LPG and LNG and a significant percentage of its refined fuels and a major port for trading of Pakistan.The Arabian Sea is not a side sea rather it's one of the routes through which India imports the majority of crude, LPG and LNG and a considerable proportion of refined fuel exports; Karachi is the principal sea gateway of Pakistan.

In the aftermath of every tension in the India-Pakistan relations, maritime insurance companies and shipping brokers have seen the additional war risk premiums escalate, the rerouting of tanker traffic further away from the coast, and delayed port turnaround time as charterers seek more security guarantees before calling at Indian and Pakistani ports. In the lead up to last year's conflict and since, insurers have been upgrading the risk to “moderate” in the eastern Arabian Sea while at the same time brokers were pricing up premiums at 15-25 per cent up, with some estimates suggesting they could go up by as much as 100 per cent if a naval incident with a merchant vessel actually did occur.

It was a naval incident, but this week's case falls squarely in the insurance world's most closely guarded category and if it doesn't impact freight costs, fuel prices and insurance premiums then any escalation will almost inevitably flow into freight costs, fuel prices and insurance premiums throughout a route through which much of South and West Asia's energy trade passes. It is also no surprise that India's domestic shipbuilding and defence manufacturing stocks have risen on this very type of news in the past, as the market has come to recognise geopolitical tensions between the Indian sub-continent states as a recurring, almost inevitable, phenomenon that is priced into stocks.

A more levelheaded regional reading of the situation, as noted by maritime security analysts in Lahore and Islamabad, is that there is no sign of escalatory signalling (radar lock-on, chaff canisters thrown, overflights) and this appears to be a contained incident, much like the escalatory games of shoving that are now more common in China and Philippines waters in the South China Sea. Restraint, however, is not containment as in architecture.