The recent Ukrainian attack on an Iranian ship in the Caspian Sea has raised concerns that Russia's war against Ukraine i conflict with Iran increasingly intertwined, writes DW.
Ukraine announced that the ship was transporting military equipment from Iran to Russia. Iranian state media, citing Iranian Ambassador to Russia Kazem Jalali, reported that the cargo ship "Ana" was anchored about five kilometers from the entrance to the Volga River when it was hit by drones, which caused an explosion. According to reports, one sailor was killed.
Iran invited the Ukrainian chargé d'affaires to speak and described the incident as an act of aggression.
Ukrainian President Volodymyr Zelensky, on the other hand, said that Ukrainian forces had successfully carried out long-range strikes on a Russian warship and other vessels that Kiev claims were carrying military cargo.
Ukraine has long accused Iran of helping Russia wage war by supplying and developing Iranian-designed drones.
Tehran has previously admitted that it sells drones to Moscow, but rejects accusations that it was supplying weapons specifically intended for the war in Ukraine.
However, the Ukrainian military has extensive material evidence that Iranian-designed Shahed drones have been used throughout the war, which has lasted for more than four years.
Drones – masters of "death zones" in Ukraine
According to the data of the Ukrainian Air Force, in March 2026, Russia launched almost 950 drones of the Shahed, Gerber and other attack drones into Ukraine within just 24 hours.
Iran's foreign ministry has accused Ukraine of trying to expand the geographical scope of its war with Russia. In contrast, Kiev presents its attacks in the Caspian Sea as an attempt to disrupt military logistics routes supporting Moscow.
Will Iran attack Ukraine?
Iranian Foreign Minister Abbas Aragchi announced that the attack "cannot go unanswered."
However, Ahmad Vahshiteh, director of the Moscow-based Center for Strategic Research on the Development of Relations with the Middle East, told DW that it is unlikely that Tehran will immediately respond with a direct military strike on Ukraine.
"I believe that the Islamic Republic will avoid an emotional reaction and opt for a diplomatic, not a military, response," he said, pointing to the invitation of a Ukrainian diplomat and the possibility of raising the issue in the United Nations Security Council.
Ukrainian Foreign Minister Andriy Sibiga wrote on the X Network on Monday that Iran's accusations were "unjustified and baseless."
"The regime in Tehran is a direct accomplice of Russian aggression against Ukraine and supplies Moscow with weapons that have been killing Ukrainians since 2022," he said.
A day later, during a telephone conversation with Aragchi, Sibiga softened his tone and said that Ukraine wanted to avoid an unnecessary escalation with Iran.
Ukrainian Middle East expert Igor Semivolos believes that the probability of Iranian retaliation in the form of an attack on Ukraine is very small.
"Attacks on ships or ports in the Caspian Lake are one issue, because it is related to Russia. An Iranian missile attack on the territory of Ukraine would be something completely different. It would be a direct act of war," he said.
According to Semivolos, such a move "would only further complicate the situation for Iran."
Austrian military expert Markus Reisner tells DW that an Iranian missile attack on Ukraine is unlikely, even though Tehran has medium-range missiles.
Reisner believes that Iran has little reason to target targets on Ukrainian territory when there are more important or valuable targets elsewhere.
There is no "new front" against Iran
Reisner - who currently heads the research sector of the Theresianum Military Academy in Austria - believes that the attack in the Caspian Sea does not mean that Ukraine has now become a participant in the war against Iran. He reminds that since May, the Ukrainian army has been intensifying attacks on naval facilities, especially in the Sea of Azov and the Black Sea.
So far, around 200 Russian ships, tankers and tugboats have been hit.
"Ukraine's goal is not to open a new front against Iran, but to disrupt supply routes between Iran and Russia and in the Caspian Sea," Reisner said.
However, Moscow analyst Vakhshiteh believes that the attack "can be seen as a signal that the geography of the Ukrainian war is expanding from the Black Sea to the Caspian Sea."
Semivolos agrees with that. In his opinion, it is logical for Ukraine to expand its strategy of controlling the sea routes for the delivery of weapons and try to impose a wider economic naval blockade on Russia in the south.
Did Ukraine coordinate the action with the USA?
There is no direct evidence that the operation in the Caspian Lake was coordinated with the United States, nor has it been discussed publicly, Semivolos says. "But it's obvious that Ukraine uses American intelligence. That's why the Americans most likely knew about the operation," he believes.
Austrian military analyst Reisner emphasizes that the timing of the Ukrainian attack plays a key role. "Zelensky clearly wants to show that Kiev and Washington have a common enemy in Iran," Reisner said.
In his opinion, the attack can be interpreted as a message from Kiev that Ukraine is a more reliable ally in confronting Iran than some NATO members.
Zelensky met with the American president this week Donald Trump in Washington, at a time when relations between Kyiv and the Trump administration are getting better, parallel to Ukrainian successes on the front.
Will the attacks in the Caspian Sea continue?
As Sibiga's post on Network X shows, Kiev increasingly views Iran and Russia as part of the same military ecosystem.
Meanwhile, Ukraine has demonstrated that it has the ability to carry out long-range drone strikes deep inside Russian territory.
Semivolos expects Ukraine to continue operations in the Caspian Sea. The timing of the operation is explained by the fact that the Ukrainian army now possesses the technical capabilities to carry out such strikes.
If Ukraine attacks Iranian ships again, Tehran will face an awkward strategic choice.
Vahshiteh believes that a direct military response against Ukrainian territory could open a new front at a time when Iran is already under pressure from attacks concentrated in the south of the country.
He estimates that Iran may instead seek indirect ways to harm Ukraine, including measures against ships linked to Ukrainian interests.
However, even such options would carry a serious risk of further escalation, and so far there are no indications that Tehran has decided to go down that path.
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