[News] Caspian lifeline redraws the Iran–Russia war map

[Anti-Imperialist News]

 Caspian lifeline redraws the Iran–Russia war map

As Washington and Tel Aviv squeeze Iran from the south, the Caspian is
becoming the northern artery of a Eurasian supply network built beyond
western reach.

Aidan J. Simardone <https://thecradle.co/authors/aidan-j-simardone>

MAY 22, 2026 -
https://thecradle.co/articles/caspian-lifeline-redraws-the-iran-russia-war-map
Photo Credit: The Cradle

The war pressure on Iran has always been mapped from the south. US bases
ring the Persian Gulf, Israeli intelligence probes the region from
Azerbaijan and beyond, and Washington’s naval power has long treated the
narrow waterways around Iran as a pressure point.

But the more the US–Israel axis leans on the Gulf, the more Tehran’s
strategic depth shifts northward, across a closed body of water that
western planners cannot easily dominate.

The Caspian Sea
<https://thecradle.co/articles/under-fire-moscow-and-tehran-close-ranks>
now matters because it gives Iran and Russia something both states urgently
need, a direct, politically controlled route outside the reach of hostile
land corridors.

Overland trade must pass through states that are either aligned with
Washington or unwilling to risk US secondary pressure. The Caspian, by
contrast, links the two countries without a third-party gatekeeper.

Ships can still be hit by drones and missiles, but reaching them requires
far deeper penetration into Iranian space and carries the danger of
confrontation with Russia. In the short term, the Caspian offers Tehran a
reliable supply line. Over the longer term, it could deepen Iran–Russia
integration
<https://thecradle.co/articles/iran-and-russia-three-steps-into-strategic-convergence>
and become a central route connecting Russia to West Asia, India, and the
wider world.

*The legal battle over a closed sea*

Is the Caspian really a sea? It’s not a trivial question
<https://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1870-46542020000100235>.
If it’s a sea, it’s subject to the UN Convention on the Law of the Sea
(UNCLOS), under which territory extends 12 miles from the coastline, after
which free navigation applies. If treated as a lake, the territory extends
to borders mutually agreed upon by the surrounding states.

Until 1991, only two states occupied the Caspian: Iran and the USSR. In
1921, the Russo–Persian Treaty of Friendship
<https://www.mohammadmossadegh.com/news/russian-documents/iran-russia-treaty-of-friendship-february-26-1921.pdf>
prohibited other countries from navigating it. But when the Soviet Union
fell, three new states joined the Caspian: Azerbaijan, Kazakhstan, and
Turkmenistan. These former Soviet Republics disputed the 1921 treaty,
insisting on negotiations that took UNCLOS into consideration
<https://www.researchgate.net/publication/320183299_LEGAL_STATUS_OF_THE_CASPIAN>
.

All the former Soviet Republics, including Russia, wanted the Caspian
to be treated
like a sea
<https://www.researchgate.net/publication/372824912_LEGAL_STATUS_OF_THE_CASPIAN_SEA_IN_INTERNATIONAL_LAW>,
but because Iran’s short coastline would give it less territory, it
insisted the Caspian was a lake. The potential for UNCLOS to apply would
have also allowed the entry of foreign military vessels 12 miles away from
Iran. This was not a hypothetical fear, given Azerbaijan's close alliance
<https://jacobin.com/2023/11/israeli-weapons-gaza-nagorno-karabakh-colonialism-displacement>
with Israel. Were it to host the Israeli navy, Tel Aviv could open a front
<https://thecradle.co/articles-id/31846> in Iran’s north.

The failure to come to a consensus made the Caspian’s legal status
ambiguous, depriving the region of further integration. For instance, the
proposed Trans-Caspian Pipeline would connect Turkmenistan with Azerbaijan,
bringing oil and gas from Central Asia to Europe. But with no clarity on
who owned the seabead, the project stalled
<https://behorizon.org/why-upcoming-convention-will-not-solve-trans-caspian-pipeline-problem/>
.

In 2018, the five states came to a decision. The Caspian was not a lake or
a sea, but a unique body of water that would be subject to the Convention
on the Legal Status of the Caspian Sea, also known as The Caspian Sea Treaty
<https://valdaiclub.com/multimedia/infographics/convention-on-the-legal-status-of-the-caspian-sea/>
.

Similar to UNCLOS, states would have 15 miles of territory from the
coastline and a further 10 miles for fishing. The remaining area would be
shared, and any state party to the treaty could lay submarine cables and
pipelines.

But unlike UNCLOS, states not party to the treaty were prohibited from
stationing their armed vessels. Iran did not secure its maximalist demand
to have the Caspian classified as a lake, but the exclusion of outside
militaries gave it the protection that mattered most.

*Caspian cooperation*

The treaty gave the littoral states a framework for cooperation, but for
Iran–Russia ties, the Caspian remained underused as long as land routes
were available. As cooperation over Syria deepened, Moscow proposed the
International North–South Transport Corridor (INSTC
<https://eabr.org/en/analytics/special-reports/the-international-north-south-transport-corridor-promoting-eurasia-s-intra-and-transcontinental-conn/>)
in 2013, a network of pipelines, railways, and highways linking Russia
through Azerbaijan to Iran, then onward to India and the wider world.

Everything changed when Russia invaded Ukraine in 2022. While Azerbaijan
did not impose its own sanctions against Russia, it did provide humanitarian
aid
<https://caliber.az/en/post/sybiha-azerbaijan-s-humanitarian-aid-to-ukraine-exceeds-45-million-since-2022>
to Ukraine and vocalized support for its territorial integrity
<https://carnegieendowment.org/russia-eurasia/politika/2026/05/azerbaijan-ukraine-cooperation>,
and claimed it was complying
<https://en.apa.az/foreign-policy/hikmat-hajiyev-baku-is-very-vigilant-on-the-sanctions-story-485065?utm_source=chatgpt.com>
with secondary sanction rules.

Meanwhile, Iran–Russia cooperation <https://thecradle.co/articles-id/280>
accelerated. With Russia joining Iran in being sanctioned, there was no
longer an incentive for Moscow to restrict trade with Tehran. Moscow also
had to look for other suppliers for its military. Iran provided drones that
were decisive
<https://www.tandfonline.com/doi/full/10.1080/25751654.2022.2149077> on the
battlefield.

Why rely on Azerbaijan when the Caspian was right there? Nearly 1,000
kilometers away from the Russia–Ukraine frontline, it provided a
direct and covert
route
<https://www.caspianpolicy.org/research/security/russias-weapons-transport-via-the-caspian-sea?utm_source=chatgpt.com>
for weapons heading from Iran to Russia. In return, Russia supplied more
goods to Iran.

In 2022, the Iranian port of Noshashr hosted its first
<https://valdaiclub.com/a/highlights/expanding-maritime-trade-between-iran-and-russia/>
Russian cargo ship in 21 years. That same year, Iranian and Russian
shipping companies teamed up
<https://www.hellenicshippingnews.com/russias-astrakhan-region-iran-to-form-joint-shipping-co/>
to form a new corporation that would develop the INSTC. In 2025, shipping
at Iran’s port of Anzali was up 56 percent
<https://wanaen.com/caspian-port-sees-56-increase-in-ship-dockings/>.
Map of the  International North–South Transport Corridor (INSTC).

*The northern route under fire*

After the US-Israeli war of aggression on Iran, Washington blockaded the
Persian Gulf. Land transport also became riskier, with neighboring states
such as Azerbaijan, Pakistan, and Turkiye maintaining close ties with the
US.

The Caspian became crucial again, this time with the flow reversed as
Russia sent weapons and critical goods to Iran. A recent *New York Times*
(NYT) piece alleges
<https://www.nytimes.com/2026/05/09/world/middleeast/caspian-sea-iran-russia.html>
that Russia has been sending drone parts to Iran through the Caspian.

Drones proved vital for Russia in Ukraine, and they have also helped Iran
strike US military installations across West Asia. Russian ships have
reportedly carried basic goods, including food, to help Iranians withstand
the blockade.

The US and Israel can strike ships or ports on the Caspian Sea, but the
risks are significant. The Caspian sits far from Israel and US military
bases near the Persian Gulf. Any attack on Iranian assets there also risks
drawing Russia directly into the conflict, particularly when those ports
serve as docking points and logistical nodes for Russian vessels.

That is why the publicly confirmed Israeli strike wave on Bandar Anzali in
March 2026 triggered a sharper Russian response
<https://www.aa.com.tr/en/world/russia-would-view-iran-war-spillover-into-caspian-sea-extremely-negatively-kremlin/3877321>
than a routine condemnation. The attack hit the largest Iranian port on the
Caspian, a commercial and military hub tied into the same maritime route
Russia uses to move cargo to and from Iran.

Russian Foreign Ministry spokesperson Maria Zakharova warned
<https://mid.ru/en/foreign_policy/news/2087229/?> that the strike affected
“the economic interests of Russia and other regional countries” with
transport links to Iran, and said such “reckless and irresponsible actions”
risked “dragging the Caspian states into the military conflict.”

The warning was repeated
<https://english.aawsat.com/world/5254321-russia-expresses-concern-over-spread-iran-war-caspian?>
at a higher political level. After Russian Foreign Minister Sergei Lavrov
spoke with his Iranian counterpart Abbas Araghchi, Moscow said both sides
expressed concern over the “dangerous spread of the conflict provoked by
Washington and Tel Aviv to the Caspian Sea area.”

Kremlin spokesperson Dmitry Peskov then said
<https://www.reuters.com/world/russia-says-it-would-be-very-concerned-by-iran-war-spillover-into-caspian-sea-2026-03-24/?>
Russia would view any spillover of the Iran war into the Caspian “extremely
negatively,” while declining to comment directly on reports that Israeli
strikes had targeted vessels allegedly carrying Russian weapons to Iran.

Tehran also moved to turn the strike into a Caspian-wide security issue
rather than a narrow bilateral matter. Araghchi warned
<https://www.aa.com.tr/en/americas/iran-demands-firm-stance-from-caspian-coastal-states-after-us-israeli-attack-on-bandar-anzali/3880936?>
that attacks on Bandar Anzali had “seriously endangered security and
stability in the Caspian Sea,” calling on the coastal states to take a
“firm and unified stance” against the destabilizing act.

The message was clear enough. Once the war reached Iran’s northern coast,
it touched the interests of every littoral state that depends on the
Caspian remaining outside the US-Israeli battlefield.

Ukraine has struck the Caspian three times
<https://defence-blog.com/ukraine-strikes-russian-naval-vessel-in-caspian-sea/>
in recent months. The timing, against the backdrop of the Iran war, is
suspicious, though the targets so far have been Russian military assets.
For Tehran, that means the Caspian route remains largely secure, especially
when compared with the exposed southern approaches around the Persian Gulf.

*Eurasian depth beyond the blockade*

When the war ends, the Caspian will remain critical for both Russia and
Iran. More than a decade ago, Moscow saw the INSTC as a way to reach India
while bypassing Europe. Under conditions of western sanctions, war
pressure, and the expansion of Atlanticist containment, that old plan has
gained new weight.

If sanctions are eventually lifted and India moves further away from
western dependency, the corridor could become one of the key arteries of a
multipolar order. It would give Russia a route to the Indian Ocean, give
Iran a central role in Eurasian trade, and weaken the US ability to isolate
either state through maritime pressure or financial coercion.

Given its advantages, the Caspian took a surprisingly long time to reach
its current importance. Its legal status was only clarified in 2018, and
before the Ukraine war, overland routes still appeared viable. But as
Moscow and Tehran tighten cooperation in a hostile international
environment, the Caspian is no longer a secondary route. It is becoming one
of the quiet pillars of the Eurasian answer to US hegemony.
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