According to Iranian authorities, the Ukrainian attack on vessels sailing between Russian and Iranian ports on the Caspian Sea killed one Iranian sailor and injured three others, prompting Tehran to summon Ukraine’s chargé d’affaires and condemn the strike as a “hostile and criminal act.”
It marked Ukraine’s first known attack on an Iranian vessel — it has previously hit Russian targets in and around the sea — and caused Iran’s foreign ministry to describe President Volodymyr Zelenskyy as “the head of the Ukraine regime”. It pledged the late July attacks would be answered. Zelenskyy subsequently confirmed Ukrainian strikes against vessels which he said were transporting Iran-linked military cargo, thus removing any ambiguity regarding Kyiv’s intent. One vessel was traveling from Russia’s Astrakhan to Iran’s port of Anzali.
Ukraine has had more than enough legal justification to attack Iran for several years. Putting aside the 2022 downing of a Ukrainian jet by Iranian air defenses in 2020, killing 176 people, Tehran has given very extensive military aid to Russia since 2022. The importance of Tehran’s assistance has declined from its peak, but the symbolism of a Ukrainian attack at a time when the US is engaged in hostilities with the Islamic Republic is clear.
From Kyiv’s perspective, striking the logistics chain that links Iran with Russia imposes costs on both. Rather than attempting to intercept weapons after they reach Russia, Ukraine seeks to disrupt supply before equipment enters the military production cycle.
For Iran, however, the implications are much broader. Tehran has consistently maintained that it is not directly participating in the Russia-Ukraine conflict and has portrayed commercial shipping across the Caspian as civilian activity. The attack undermines this by highlighting the widespread belief that the Caspian transport network has become an integral element of Russia’s war effort.
The Caspian Sea is important for Russia and Iran as the only direct connection they possess. It was through that artery that the first Iranian Shahed drones reached Russia in 2022.
Iran has abstained from open military retaliation. But while this was attributed to the diffusion of tensions after the Iranian and Ukrainian foreign ministers held a brief phone call, Iran’s hesitancy is better explained by practical limitations.
The Islamic Republic does have ballistic missiles that could reach and successfully hit targets in Ukraine, but doing so would be a costly operation with only a limited impact on Ukraine. A Machiavellian reading would suggest that it might even be welcomed in Kyiv, as a demonstration that Ukraine and the US are fighting the same enemy. The Kremlin is surely extremely nervous about any Iranian campaign for just this reason.
The attack demonstrates that Iran suffers real weaknesses on the Caspian. The country’s attention is mostly focused on the military and security situation in the Gulf, Iraq, and to a certain degree around Afghanistan and Pakistan. This also means that, in terms of military capabilities, the Caspian is less defended; that explains how easily the United States has been hitting the military targets there. Israel also hit there in March, doing serious damage to the Iranian navy.
Iran’s retaliation might therefore come later and more subtly. In this, it’s likely to be aided by Russia and the extensive military and intelligence ties. For instance, Iran could increase deliveries of missile components, drone technology or electronic warfare systems, effectively allowing Russia to impose additional military costs on Ukraine. Moscow values such support, but Iran too is in dire straits when it comes to weaponry and dual-use components for its own defense. Cyber operations are most likely, given that Iranian cyber organizations possess demonstrated capabilities that can undermine foreign infrastructure and government networks (although Ukraine too boasts extensive cyber capabilities).
What of Ukraine’s growing role in the South Caucasus? Lately, Kyiv has been actively developing military and economic ties with Azerbaijan, which has often been targeted by Iranian officials as a country allegedly hosting Israeli intelligence assets. Baku’s ties with Kyiv could further inflame those fears in Tehran, given that Azerbaijan is interested in Ukraine’s drone capabilities.
The targeting of Iranian and Russian vessels in the Caspian Sea signals the widening geography of Russia’s war on Ukraine. Ukrainian drones have already visited Russian-occupied Abkhazia, in Georgia, and some parts of the North Caucasus.
Indeed, the Caspian Sea — long regarded as a closed strategic space shared by Russia, Iran, Kazakhstan, Azerbaijan and Turkmenistan — could now be evolving into another active theater of geopolitical competition. Ukraine is no longer limiting its long-range campaign to military infrastructure directly connected to the battlefield, and is increasingly targeting the wider logistics architecture sustaining Russia’s war effort.
Emil Avdaliani is a research fellow at the Turan Research Center and a professor of international relations at the European University in Tbilisi, Georgia. His research focuses on the history of the Silk Roads and the interests of great powers in the Middle East and the Caucasus.
Europe’s Edge is CEPA’s online journal covering critical topics on the foreign policy docket across Europe and North America. All opinions expressed on Europe’s Edge are those of the author alone and may not represent those of the institutions they represent or the Center for European Policy Analysis. CEPA maintains a strict intellectual independence policy across all its projects and publications.
