New Delhi and Islamabad summoned each other’s top diplomats to lodge strong protests after an Indian and a Pakistani naval vessel collided in international waters. India’s foreign ministry said that it had called in Pakistan’s senior envoy to formally register a strong objection over what it said was “unacceptable and unprofessional conduct” of Pakistani naval units that led to a collision with an Indian warship. Pakistan’s foreign ministry also said it had officially called upon the charge...