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Russia and Iran are rapidly scaling commercial and military shipments across the Caspian Sea, with four Iranian ports operating around the clock to absorb cargo diverted from the Strait of Hormuz since the U.S. naval blockade took effect on April 13, according to port data and trade officials.
The shift has turned a historically secondary waterway into a frontline logistics corridor. Cargo tonnage on the route could double by the end of 2026, Alexander Sharov, head of RusIranExpo, a firm connecting Russian exporters with Iranian buyers, estimated in an interview reported this week. Commodities analytics firm Kpler said roughly a dozen vessels from Russia, Kazakhstan and Turkmenistan carrying grain, corn and sunflower oil arrived at Iranian Caspian ports since mid-April alone.
Ports absorb diverted cargo
Iran’s largest Caspian facility, Bandar Anzali, is now operating at near full capacity alongside three other northern ports. Mohammad Reza Mortazavi, head of the Association of Iran’s Food Industries, told state broadcaster IRIB that essential food imports are being actively rerouted through the Caspian corridor. Two million tons of Russian wheat previously shipped annually via the Black Sea are now transiting the Caspian instead, according to Vitaly Chernov, head of analytics at PortNews Media Group, which tracks Russia’s maritime sector.
The corridor carries strategic as well as commercial significance. U.S. officials told media outlets that Russia is shipping drone components to Iran through the Caspian to help rebuild offensive capabilities after Tehran lost an estimated 60 percent of its drone arsenal in recent fighting. Vessels on the route routinely disable transponders, and only five bordering nations have access to the landlocked body of water, placing it beyond the reach of U.S. naval interdiction.
Capacity constraints limit throughput
Analysts caution that Caspian infrastructure cannot replicate the volumes that once flowed through Hormuz. Steve H. Hanke, a professor of applied economics at Johns Hopkins University, said alternative routes can supply consumer goods, food and industrial materials but noted that Caspian throughput is constrained by port and fleet capacity. He projected higher landed costs and inflation in tradeable goods but not the total economic collapse some observers have predicted.
Bandar Anzali sustained damage from Israeli air strikes on March 18 that targeted naval facilities and destroyed several vessels. Grain shipments between Russia and Iran were temporarily halted after the strike but have since resumed, according to Kpler.
Sanctions evasion concerns grow
Nicole Grajewski, a professor specializing in Iran and Russia at Sciences Po in Paris, described the Caspian as an ideal location for sanctions evasion and military transfers. The 2018 Convention on the Legal Status of the Caspian Sea bars extra regional naval powers from establishing a presence on the waterway.
The route forms a core segment of the International North South Transport Corridor, a 7,200 kilometer multimodal network linking Russia to the Indian Ocean. For the global shipping industry, the escalating use of the Caspian signals a structural rerouting of cargo flows that could persist well beyond the current conflict.
