In Brief
- Iran says it will "answer" a Ukrainian strike on an Iranian cargo ship.
- Experts say Ukraine could reframe the conflict to seek US military support.
Ukraine's attack against an Iranian cargo ship in the Caspian Sea has sparked fears of a widening conflict and the convergence of two major wars.
Iran has vowed it will retaliate against Ukraine after its president, Volodymyr Zelenskyy, said his military carried out long-range strikes in the Caspian Sea against vessels transporting military cargo involving Iran on Sunday.
Iran says Ukraine's "hostile and criminal" act and subsequent explosion against what it said was a commercial vessel killed one sailor and injured another, and its foreign minister Abbas Araghchi vowed the attack "cannot go unanswered".
The incident marks the first time the two sides, who are already fighting wars of their own — Ukraine against Russia and Iran against the United States — have come to a potential confrontation.
An expert says one side in particular can gain from a strategic shift.
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Why did Ukraine target Iranian vessels?
Ukrainian officials say the vessel was carrying components for drones and missiles from Iran to Russia. Iranian counterparts, however, said the vessel was "entirely civilian" and carrying "no military cargo".
Ukraine's foreign minister, Andrii Sybiha, denounced Iran's threats of retaliation as "unjustified and groundless".
"The regime in Tehran is a direct accomplice to Russian aggression against Ukraine, fuelling Moscow’s criminal war with weapons that have killed Ukrainians since 2022," he said.
Iran is a major supplier to Russia of its deadly, cheap Shahed drones, which have been used in the war in Ukraine, especially in the earliest phase.
"They were technology that Russia hadn't didn't have in its own arsenal at the time," Adam Lockyer, an associate professor in strategic studies at Macquarie University, told SBS News.
"Its dependency upon Iranian drone technology has decreased over time, but still, you can see that those two parties have been helping each other and mutually supporting each other where they can."
On Sunday, Zelenskyy also said Russia was handing Iran its satellite observations of Gulf states and US military sites, to assist its strikes in the Middle East.
"There is a clear correlation between Russia's satellite imagery of these sites and Iranian strikes," he said.
Ukraine said its strike was part of a wider attack against a Russian oil field and a Russian missile boat on that day.
The waterway's location is also significant: Iran has been relying on its northern routes, including the Caspian Sea, to circumvent a US naval blockade.
'Only downsides for Putin'
The timing of the incident is also significant. Zelenskyy is due to meet with US President Donald Trump in Washington on Wednesday.
The pair's last White House meeting took place in October, when Zelenskyy failed to convince Trump to provide Ukraine with Tomahawk cruise missiles. They've met a handful of times since then, including at Trump's Mar-a-Lago resort in December and on the sidelines of this month's NATO summit in Türkiye.
Some analysts say Ukraine could be acting strategically to seek US support.
"We have seen the Trump administration being hesitant to supply arms to Ukraine. But if it is sort of re-framed as one conflict, this really does help Ukraine," Lockyer said.
"If [the US] see the Ukrainians fighting the good fight against the Iranians, they'll be more likely to supply Ukraine with some of the weapon systems they desperately need, like the Patriot systems.
"If the Ukrainians are successful in re-framing the conflict, so that the Trump administration does begin to see Ukraine as fighting against both Russia and Iran, and being one of their only supporters of their conflict against Iran, this only has downside for Putin and Russia."
Trump recently appeared to offer the Ukrainians a licence to manufacture Patriot missiles but experts say that even if a deal is formalised, it won't help in the short-term.
Some commentators have questioned Ukraine's strategy.
"The main idea ... is to disrupt trading routes and cause as much damage as possible," former Ukrainian intelligence official Ivan Stupak told the BBC.
"But it's not a good idea for Ukraine to have another battlefront with Iran. It's not good for us."
Meanwhile, Iran's ambassador to Russia, Kazem Jalali, has called on Russia to respond to the strike, according to Iranian state media. He reportedly said Russia, as a "friendly nation", is expected to deliver a "serious response".
However, Russian intervention may be unlikely — the Kremlin would probably be trying to de-escalate the prospect of Iranian retaliation.
"What ... Putin has been doing, and reasonably successfully, is trying to put a wedge in between Ukraine and the United States," Lockyer said.
"So they would probably be urging Iran to not retaliate against Ukraine if they can."
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