Russian border authorities have temporarily halted all cargo traffic through the Azov-Don Canal and the Kerch Strait, the maritime corridor linking the Don River to the Black Sea, after a series of Ukrainian drone attacks on vessels in the Azov Sea. Three sources in the grain export sector told Reuters that shipping companies were notified on Friday evening that requests for passage would no longer be accepted, with no indication of when the restrictions might be lifted. The suspension immediately rippled through commodity markets, with Euronext wheat futures rising 4 per cent to six-week highs.

Ukraine’s Unmanned Systems Forces claimed responsibility for striking at least 48 vessels in the area over five days, describing the targets as tankers belonging to a ‘shadow fleet’ used to circumvent Western sanctions on Russian oil. Russian officials have acknowledged several drone incidents in the Taganrog Bay since early July, including an overnight attack that injured one sailor and damaged a methanol tanker, though they said there was no risk of a chemical spill. Moscow has not issued an official statement on the canal closure, and the ministries of transport and agriculture did not respond to requests for comment.

Viewed from European trading floors, the disruption is the first direct wartime blow to Russian grain logistics. Analysts in London and Geneva estimate that up to a quarter of Russia’s wheat exports—the country is the world’s largest supplier—pass through the Azov Sea, with the bulk loaded at ports in the Rostov and Krasnodar regions. A prolonged interruption could tighten global supply at a moment when adverse weather in other breadbaskets is already straining markets. Grain traders note that the Black Sea route has remained a vital artery for both Russian and Ukrainian shipments despite the conflict, and any sustained blockage risks amplifying food-price inflation in import-dependent nations.

The Azov-Don Canal has been a critical chokepoint for Russian agricultural exports since the full-scale invasion of Ukraine in 2022, as Moscow sought to redirect trade flows away from contested western Black Sea lanes. The current suspension, however, is the first triggered by direct attacks on commercial shipping in these waters. Ukrainian military spokesmen have signalled that the campaign against the shadow fleet will continue, while Russian border guards have given no timeline for reopening the waterway. Market participants and regional governments are now watching for any official Russian announcement or alternative routing measures that could ease the immediate supply shock.