Iran has accused Ukraine of attacking an Iranian commercial vessel in the Caspian Sea, saying the incident caused an explosion on board. Iranian authorities say one sailor was killed and another was injured.

Tehran described the reported attack as a criminal act and said the issue has become a diplomatic matter as well as a security incident. According to the available report, Iran's Ministry of Foreign Affairs summoned Ukraine's representative following the accusation.

The allegation is significant because it involves a commercial ship in the Caspian, an important route for regional trade and transport. Any reported attack in those waters is likely to heighten concern over maritime safety and add to already tense relations tied to the wider conflict involving Ukraine.

Only limited details were available in the trimmed report, and no further operational information was included. For now, the case centers on Iran's claim, the casualties reported on the vessel, and the diplomatic fallout between Tehran and Kyiv.