Iran on Saturday blamed Ukraine for an attack on an Iranian commercial vessel in the Caspian Sea that killed one sailor and injured another. Citing Iran’s Foreign Ministry, the state news agency IRNA said an explosion struck the ship in the morning. Tehran also warned that it would respond to the incident.

The accusation followed Ukrainian President Volodymyr Zelensky’s statement that Ukraine’s armed forces had achieved a “very powerful success” in long-range strikes in the Caspian Sea. He said the targets included vessels used to transport Iran-linked military cargo and a warship. Ukraine’s SBU intelligence agency said on Telegram that drones had struck cargo ships under international sanctions that were used to transport military supplies between Iran and Russia.

Iran’s Foreign Ministry said the Islamic Republic had never intervened in the Russia-Ukraine conflict. State television reported that Iran summoned Ukraine’s chargé d’affaires in Tehran to protest what it called hostile and criminal actions. The ministry also said Foreign Minister Abbas Araghchi sought a strong response from the European Union and the UN Security Council in a call with EU foreign policy chief Kaja Kallas.