Ukraine said it struck 28 Russian vessels, including 21 oil tankers, during overnight operations in the Sea of Azov on Friday, forcing Moscow to suspend navigation through key waterways, according to Ukrainian officials and Reuters.
Ukraine's Unmanned Systems Forces said the operation targeted 21 tankers, four tugboats, two dry cargo vessels and one specialised vessel, claiming 73 successful strikes.
Force commander Robert "Madyar" Brovdi said the attacks had reduced Russia's "shadow tanker fleet" and appeared to have halted traffic through the Kerch Strait.
Ukraine's General Staff said the targeted tankers were used to transport oil products in violation of international sanctions, helping finance Russia's war effort. It added that the other vessels supported Russian military logistics, cargo transport and port operations. The extent of the damage has not been independently verified.
Brovdi also said Ukrainian forces struck 53 military targets in occupied Crimea and other Russian-controlled areas in southern Ukraine, including naval facilities and fuel infrastructure, as part of the ongoing "Crimean Switch Off" campaign.
Meanwhile, Reuters, citing three Russian grain export sources, reported that Russia had temporarily suspended navigation through the Don-Azov Canal, a key waterway linking the Don River with the Sea of Azov. One source said Russian border guards also stopped accepting new applications for ships to transit the Kerch Strait from 6:10pm local time on July 10, although no timeframe for the restrictions was announced.
Analysts said around one-quarter of Russia's wheat exports pass through the Sea of Azov. Concerns over supply disruptions pushed Euronext wheat futures up by as much as 4%, reaching their highest level in six weeks.
Ukraine's claims and the reported scale of the damage could not be independently verified, and Russia has not officially commented on the reported attacks.