Russia is shipping drone components, ammunition and TNT to Iran through the Caspian Sea, helping Tehran rebuild stockpiles depleted by U.S. and Israeli strikes, according to a European government document obtained by NBC News and verified by a Western official. More than two dozen Russian vessels have delivered the material to Iran’s Amirabad port, reversing Iran’s earlier role as Russia’s main drone supplier. The Caspian’s 2018 legal convention bars non-littoral military forces, leaving Western navies no basis to intercept the shipments. The support extends beyond hardware: US officials told the New York Times on August 11 that Russia has also shared “advanced drone tactics” with Iran, including a swarm-and-relay method Iran used to down a US F-15E in April, adapted from Russia’s war in Ukraine.
Ukraine said it struck vessels carrying military cargo between Iran and Russia in the Caspian Sea on July 25; Iran said one attack hit an Iranian commercial vessel, killing one sailor. Iran’s Foreign Minister Abbas Araghchi called the strike a violation of the UN Charter that “cannot go unanswered,” and Tehran summoned Ukraine’s chargé d’affaires in protest, according to Al Jazeera. Iran reportedly considered a symbolic ballistic-missile strike on a Ukrainian port in retaliation, according to Kyiv Post’s summary of New York Times reporting, but abandoned the plan after diplomatic contacts between Araghchi and his Ukrainian counterpart.
The episode illustrates how the Ukraine and Iran wars have become logistically intertwined, with the same Caspian corridor now moving weapons in both directions between Moscow and Tehran. Ukrainian President Volodymyr Zelensky has separately accused Russia of sharing satellite surveillance of Gulf states and U.S. military facilities with Iran. No public diplomatic mechanism currently appears to address the Caspian arms route itself.
