Iranian Foreign Minister Abbas ​Araghchi said on Sunday that a Ukrainian attack on an Iranian commercial vessel “cannot go unanswered”.

Iran said the attack in the ​Caspian Sea resulted in an ​explosion that killed one sailor and ⁠injured another.

Araghchi made the comments in calls ​with EU foreign policy chief Kaja ​Kallas and Russian Foreign Minister Sergei Lavrov, Araghchi posted on X.

Lavrov, in a statement ​posted on the Russian Foreign Ministry’s ​website, offered condolences in connection with the death ‌of a sailor in the attack.

Lavrov said Araghchi thanked local authorities in the Russian region of Astrakhan, where ​the vessel ​started its ⁠journey, for helping the crew “and stressed the need to ​put an end to such ​adventures by the Kyiv regime”.

The statement also said Araghchi informed Lavrov of “continuing diplomatic ⁠efforts ​aimed at de-escalating ​tension in the Middle East”.

Earlier, Iran’s Foreign Ministry on Saturday condemned a Ukrainian attack on an Iranian commercial vessel in the ​Caspian Sea, saying it resulted in an explosion that killed ‌one sailor and injured another.

Throughout the war in Ukraine, Kyiv has had to counter Iranian-designed drones deployed by Moscow. Kyiv has offered its drone interception expertise to countries in ​the Middle East that have suffered strikes from Iran.

Tehran described the ​attack on its vessel as an act of aggression and ⁠said it would defend its national interests and security, while accusing Kyiv ​of seeking to expand the war in Ukraine.

The Iranian Foreign Ministry summoned ​Ukraine’s chargé d’affaires in Tehran to convey its protest over what it described as a “hostile and criminal” attack, Iran’s state news agency IRNA reported.

The Iranian denunciation coincided with comments ​by Ukrainian President Volodymyr Zelensky that Kyiv had noted Russia was passing ​on its satellite observations in the Middle East to Iran to enable it to direct ‌strikes ⁠in the region.

Zelensky had earlier said that Ukraine’s forces struck a Russian warship and vessels used for transporting Iranian-linked military cargo in the Caspian Sea.

The Ukrainian president, in subsequent remarks posted on X, said Kyiv had recorded ​since the beginning of ​July “active Russian satellite ⁠surveillance of the Gulf states and US military facilities located there. These images subsequently appear in Iran.”

“At the ​same time, there is a clear correlation between Russia’s ​satellite imagery ⁠of these sites and Iranian strikes — both before the attacks, in preparation for them, and afterwards, to assess the damage inflicted,” Zelensky said.

He said that on ⁠July 19 and 20 alone, Russian satellite observation had ​included four air bases: two in Bahrain, one in Jordan and one in Kuwait.