 Iran ships ammunition to Russia by Caspian Sea to aid Ukraine invasion. Iran has established a route across the Caspian Sea for the supply of large quantities of ammunition to Russia for its war against Ukraine. That's according to the Wall Street Journal, which refers to documents and officials. Russian ships are ferrying large quantities of Iranian artillery, shells and other ammunition across the Caspian Sea to resupply troops fighting in Ukraine. Middle East officials said the article reads, It adds this poses a growing challenge for the US and its allies as they try to disrupt cooperation between Moscow and Tehran. Over the past six months, cargo ships have carried more than 300,000 artillery shells and a million rounds of ammunition from Iran to Russia, the Wall Street Journal wrote. Officials in the Middle East said the most recent weapons shipment known to have crossed the Caspian Sea to Russia left in early March aboard the Razul-Gamzatov a 460-foot-long Russian cargo ship. The ship carried 1,000 containers with 2,000 artillery shells, the officials said, a previously unreported shipment. The news outlet says that the intelligence about the shipments has been shared with the US. The US and its allies have been looking for ways to disrupt transfers of weapons from Iran, which has also been an important supplier of drones to the Russian military, US officials say. Iran has primarily used cargo planes to ship weapons to Russia according to US officials, marking it all but impossible to intervene. And taking action in the Caspian Sea would require help from former Soviet republics on its coastline. US and further allies of Ukraine warned months ago that Iran was poised to send Russia ballistic missiles, but that hasn't so far materialized according to US and overseas assessments.