What is the India-Pakistan conflict at sea about? | Explained

A Pakistan Navy vessel, PNS Hunain, collided with an Indian Navy warship, INS Kolkata, in the North Arabian Sea on September 15 after, according to India, the Pakistani ship made a dangerous overtaking manoeuvre at high speed. India summoned Pakistan’s Charge d’Affaires and cited violations of Article 10 of the 1991 India-Pakistan agreement, which requires naval vessels to maintain separation of three nautical miles. Pakistan rejected India’s allegations. INS Kolkata suffered no major damage and remains at sea. PNS Hunain was damaged and subsequently returned to harbour.