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Akbar Novruz

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War in Ukraine has been ongoing for longer than World War I - yes, you heard it right. It would be difficult and irrelevant to find similarities between one and the other. However, maybe in terms of the 'staleness' of certain battles from time to time, and perhaps one of the other similarities of this war is how wars rarely stay within the boundaries assigned to them.

War in Ukraine has gradually spilt into energy markets, food supplies, cyberspace and even the Arctic. There is another frontier that emerged simultaneously on different occasions: the strategic relationship between Russia and Iran. For three years, Ukraine had seen the Iranian front through a single lens: Iran providing Russia with Shahed drones, which changed the face of Russia's attack on the cities of Ukraine. Recent events, however, suggest Kyiv may now see the relationship differently.

By extending military pressure toward the Caspian Sea, Ukraine appears to be signalling that Iranian support for Russia no longer comes without direct consequences. The Caspian Sea was not supposed to be a theatre of war. Landlocked, distant from both fronts, shared by five states, none of which is Ukraine, it appeared to offer something increasingly rare in the current global disorder: that is, the space outside the wars. And on July 25th, a Ukrainian drone ended that assumption. One sailor was killed, and three others wounded when the vessel was struck near Russia's Astrakhan port in the Volga Delta. Ukraine said the target was a ship carrying military cargo between Iran and Russia in breach of sanctions. Iran said it was a commercial vessel transporting iron.

President Zelenskyy stated through his account on X that there were "very strong results" obtained by the Ukrainian army through its long-range missile strike, which targeted "vessels used for transporting military cargo from Iran and the warship itself." The two stories do not really match. What cannot be contested, however, is that there was a Ukrainian weapon fired into the Caspian Sea that killed an Iranian citizen, forcing Iran to call the Ukrainian ambassador. Of course, this is not the first time we see this happening. Ever since December 2025, strikes on or near the Caspian Sea have been somewhat occasional. The point here, however, is not to underestimate the significance of the strike as a signal.

Ukraine's legal and strategic argument for striking the vessel is coherent, if contested. The Iranian government has supplied drones of the Shahed design to Russia, which have then been used by Russia in mass numbers; Ukraine has said that it destroyed more than 44,000 Iranian-made drones since Russia invaded the country. Zelenskyy additionally stated that Russia has provided satellite images of the Gulf States and military bases in the region belonging to the United States to Iran; there is clearly a connection between Russia's satellite reconnaissance and the attacks made by Iran. From Ukraine's perspective, a vessel transporting military cargo between two allies is a legitimate military target irrespective of its flag. From the Iranian perspective, it is a civilian ship, its cargo is iron, and its attack was unjustified.

And if the Ukrainians keep on doing that, it is inevitably going to complicate things for both Iran and Russia. It would be clever not to dramatize and say that it would be a game-changer in the war. On the other hand, such an evaluation seems to ignore the importance of the message conveyed by the attack. The message is that helping Russia comes at a price for Iran, and that Ukraine is ready to take actions in the Iranian theater that the US refrains from taking - and the latter is the most eye-catching point here.

Perspectives on what Kyiv may be attempting

The strike has prompted a debate about Ukrainian intent that is worth laying out without adjudicating. One interpretation is straightforward and operational; that is, Ukraine wants to increase the price of the military aid from Iran to Russia because of showing that the deliveries through the Caspian Sea can be targeted through the strike capabilities of Ukraine. No special strategy should be assumed because it is just a supply chain interdiction, but on a new territory.

A second interpretation is more ambitious, which is my guess. In this case, the idea behind the Caspian Sea mission is to send the message to Washington, when the Trump administration is facing tough challenges in the Iranian theater of operations and needs some leverage that it does not have yet, that Ukraine has some capabilities and readiness that can prove useful in the Iranian theater if the connection between the two theaters was formalized. Ukraine does not need anything for free. It has something to offer. Whether this offer would be valuable or not is entirely up to the perception of Washington that the two wars converge in terms of strategy. Opinions vary in the administration and within NATO.

To many in Washington, Ukraine’s message is welcome. Even as Mr Trump’s administration paused its strikes on Iran, the Caspian action underscored Iran’s vulnerability on its exposed north side. Current and former U.S. officials note that Russia has been feeding Tehran satellite intelligence to target U.S. bases in the Gulf, a service that Zelenskiy hinted at in comments on the same day as the strike.

A third reading focuses on Iran's domestic calculus. According to conservative Iranian media outlets, the strike was intended by the West and Israel as part of their efforts to broaden the war and keep the attention of the Iranians away from the Strait of Hormuz. While it may not be true, the message comes across clearly: what was meant as targeted interdiction in Kyiv might become an escalatory move for Tehran, either against Ukraine or against its own interests in the Gulf. Commentators in Iran differ on whether a retaliatory response will help maintain the element of deterrence or will drag Tehran into a larger fight between Iran and Europe/NATO.

Caspian's five-state issue

One aspect of the Caspian incident that has gone underexplored is that this sea belongs to five countries, three of which, Azerbaijan, Kazakhstan, and Turkmenistan, are neither involved in nor even participants in both wars and have maneuvered through them all with carefully maintained neutrality. In this case, the importance of the incident lies precisely in the fact that it demonstrates how the Caspian cannot be regarded anymore as an area that is isolated from the Ukraine conflict. And for Azerbaijan in particular, which has been developing its position of neutral strategy towards Russia, the West, Iran, and Central Asia for several years, the transformation of the Caspian into a front line is a problem that is not completely solved by diplomacy. For a country whose sea becomes the battlefield, neutrality in this conflict ceases to be a matter of its own choice. No statements regarding the incident in the Caspian Sea on July 25th have been made by any of the non-combatant Caspian states.

What happens next depends on choices that multiple actors are now making simultaneously and independently. Iran has to make up its mind about whether it will react, and if yes, then who, and by which means. Ukraine needs to figure out whether the strike on July 25 was a demonstration or the start of an ongoing Caspian strategy. The United States has to decide how to react to the implicit invitation hidden in the visit of Zelensky to the US capital: does Ukrainian capacity to operate in the Iranian arena represent a potential ally or problem? And Russia needs to define what kind of an attack it was, hitting its supply lines but not its soil.

One thing that appears to be certain is that the Caspian is no longer the same as it was a week ago. The attacks from Ukrainian drones on the vessels and energy assets in the Caspian Sea represent both an assertion of its increasing reach and its intention to hurt the industry that feeds the war machine of Russia, but also an acknowledgment that Iran is playing a critical role in the provision of Russian weapons. Whether such efforts are best accomplished through a one-time message or a protracted effort, whether the coincidence of the two wars presents a strategic opening or is an overreaching danger, and whether the US will be pulled into the conflict or will distance itself from it.

For Washington, the timing was apt: Mr Trump’s pause in attacking Iran suggested a diplomatic opening, and Ukraine volunteered to take on some of the burden of isolating Tehran. Whether the U.S. will fully embrace Ukraine’s expanded role is uncertain, overtly merging the two conflicts would alarm many (and play into Russia’s long claim that the Ukraine war is really a Western proxy campaign). Still, in private Western circles, the Caspian action has been largely seen as a useful complement to U.S. policy, something that additional pressure on Iran is likely to be viewed positively. For now at least, the incident has stayed below the threshold of full escalation...