At least one sailor was killed and another injured in a Ukrainian strike on a cargo vessel in the Caspian Sea, the Iranian Foreign Ministry has said, denouncing the attack as an act of aggression and warning of potential retaliation.

The drone attack was publicized on Saturday by Ukrainian leader Vladimir Zelensky, who bragged on X about achieving “very strong results with long‑range strikes in the Caspian Sea.” The strikes affected “vessels used in military cargo shipments involving Iran, as well as a warship,” Zelensky claimed on X.

Tehran responded to the incident later in the day, confirming its commercial vessel came under the “Ukrainian regime’s attack” in the landlocked waterway. The strike killed one sailor aboard the vessel and wounded another one, the Foreign Ministry said in a statement without providing any details on the extent of the damage sustained by the ship.

The ministry condemned the attack as an act of aggression that “risks further fueling and expanding the flames of war.” It urged other nations to take a “responsible stance toward this reckless action by the Ukrainian regime” and hold its leadership accountable.

“The Islamic Republic of Iran will not hesitate to protect its national interests and security. It is clear that the responsibility for the consequences of the Ukrainian regime leader’s adventurism will lie entirely with that regime, as well as its backers and instigators,” the ministry warned.

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