Ukraine's sea corridor is open. Shipowners are staying away

Ukraine's Black Sea corridor has never been formally closed. No navy blocks it, and the Ukrainian government has announced no suspension. Yet for most of August almost no one used it. The route that has carried most of Ukraine's grain since 2023 was shut not by warships but by the arithmetic of risk: shipowners, insurers and crews concluded that a call at Odesa was no longer worth it. That distinction shapes what can reopen it.

How the traffic stopped

Russia intensified strikes on Ukrainian ports and the ships in them in July. On 22 July Ukraine's agriculture minister, Taras Vysotskyi, said that no commercial vessel had entered the Black Sea ports that day, the first such day since the corridor opened in August 2023. The Turkish-owned bulk carrier Golden Leo, hit on 19 July, later sank; Foreign Policy reported ten crew killed.

Ukrainian figures reported by the Kyiv Post give the fullest count: 160 attacks on port infrastructure, 87 on ships in port and 68 on ships in the corridor between January and mid-August 2026, with more than half of each category since 1 July. The outcome in traffic terms was stark. In July 169 vessels entered Greater Odesa ports, most of them before the escalation; in the first 11 days of August, seven did.

The counts differ between sources. Foreign Policy wrote that 57 merchant vessels were targeted in July, a figure that does not map neatly onto the Kyiv Post's categories because it counts vessels rather than attacks and uses a different window. None of these figures has been independently verified, and the Russian side publishes its own claims in different terms. On 25 August Russia's Defence Ministry said it had struck five ships at Pivdennyi and Odesa and fuel storage at Chornomorsk, and described three of the cargo ships as carrying supplies for the Ukrainian military. Kyiv's position is that the ships and terminals are civilian.

A closure made by insurers

In 2022 and 2023 Ukrainian exports were stopped by a physical blockade. This time the sea lane is open and ports are working. What changed is the cost and availability of cover. OSW reported in late July that insurers had stopped writing new policies for Ukraine-bound vessels. Foreign Policy described war-risk premiums as having spiked where cover could still be found, and freight rates as having roughly doubled. We could not find a reliable, dated premium figure for August, and we leave it out.

Insurance does not change the physical risk to a crew; it only decides whether the owner can afford to take it. Once owners stop sending ships, no Ukrainian guarantee fund or naval escort can fully substitute for their decision. That is why the corridor's volume can fall to a handful of ships without anyone declaring it shut, and why Zelenskyy could say on 24 August, accurately, that there was 'no total blockade' while three or four ships a day moved through Greater Odesa.

What is at stake in volumes

The corridor matters because there is no substitute on the same scale. According to OSW, Ukraine's Black Sea ports handled 73.3 million tonnes in 2025 against 8.9 million tonnes through the Danube ports, and maritime transport carried about 95 per cent of grain exports. In the 2025/26 marketing year, which closed on 30 June, Ukraine exported 37.46 million tonnes of grain and pulses, data from the State Customs Service show, including 21.28 million tonnes of maize and 14.13 million tonnes of wheat. That was 7.8 per cent below the previous season, before the summer's disruption began.

Before July, Greater Odesa was running at 4.1–5 million tonnes a month. The Ukrainian Club of Agrarian Business estimates that alternative routes can absorb about 2.5 million tonnes a month, leaving a shortfall of 2.2–2.5 million tonnes and $450–500m of export revenue lost or delayed each month. Foreign Policy cited a lower figure for overland and river capacity, 500,000–800,000 tonnes, and an extra $45–50 a tonne in cost. The gap between the two estimates reflects whether Danube barges are counted at normal capacity; OSW noted that record low water had cut barge capacity by up to 60 per cent.

Domestic prices show the effect. Between 16 July and 6 August, second-grade wheat fell 31 per cent, from UAH 9,200 to UAH 6,400 a tonne, with barley down 27 per cent and maize 15 per cent, according to the Kyiv Post. Farmers are selling below cost into the new harvest, which is a problem for next year's planting as much as this year's exports.

Why metals are hit harder than grain

Grain can move by rail to Polish and Romanian ports or by barge, at a price. Bulk steel and ore largely cannot. GMK Center estimates that in the first half of 2026 half of Ukraine's steel exports, 95 per cent of pig iron exports and half of iron ore exports went by sea, and puts direct losses from the closure at $150–200m a month. OSW recorded more than 16 million tonnes of iron ore exported to China in 2025, worth about $1bn; that trade has no overland alternative.

The steel industry faces a second squeeze from the west. GMK Center says the EU import quota system that took effect in July could cut Ukrainian steel exports to the EU by 60 per cent against 2025. Semi-finished products, one of the few lines still growing, already carry thin margins after EU carbon border payments. Losing the sea route and a large share of the EU market at the same time leaves the sector with few places to sell.

The bargain on the table

Ukraine has not only absorbed strikes. It has attacked Russian shipping in the Sea of Azov and, on 12 August, Novorossiysk, where Al Jazeera reported three people killed and two grain terminals damaged; Zelenskyy said naval vessels and port infrastructure had been hit. The result is a rough symmetry of exposure on both sides of the Black Sea.

That symmetry produced a proposal. According to Zelenskyy, Ukraine passed a proposal through a third party on 14 August to halt mutual attacks on civilian targets at sea. By 24 August he said Russia had declined, seeking to widen the arrangement to cover Russian oil infrastructure. We found no Russian account of the offer, so its terms are known only through Kyiv.

What to watch

The corridor will reopen when owners and underwriters see that the rate of strikes on ships has fallen and stayed down, not when any statement is issued. The early indicators are daily vessel calls at Greater Odesa, whether Lloyd's market underwriters resume quoting new business, and whether the August harvest backlog in Ukrainian elevators starts to clear. The political indicator is whether the mutual-halt idea is revived with a broader scope. A deal that covers energy targets would be harder to agree but easier for shipowners to trust, because it would give both sides more to lose. Until then, Ukraine's export revenue and its 2027 budget arithmetic rest on a route that is legally open and commercially shut.

Sources

• Kyiv Post — Ships Not Entering Odesa Ports: What This Means for Ukraine's Grain Exports
• OSW — Ukraine: suspension of shipping to Black Sea ports and the associated risks
• Foreign Policy — The Black Sea's Trade Crisis Is At the Center of the Russia-Ukraine War Again
• GMK Center — The shutdown of the Black Sea corridor hits Ukrainian steel harder than at the start of the war
• GrainTrade — According to the results of the 2025/26 MY, Ukraine exported almost 37.5 million tons of grain
• Ukrainska Pravda — Zelenskyy denies that Ukraine's Black Sea corridor is completely blocked
• Al Jazeera — Ukraine hits grain terminals at Russia's Novorossiysk port, killing three
• Marine Insight — Russia Says It Struck 4 Vessels At Black Sea Port Of Pivdennyi And One At Odesa