Black Sea shipping routes: ports, cargo and war risk

Black Sea shipping routes carry Russian and Ukrainian grain, Russian and Kazakh crude, and the container and general cargo trade of six coastal states through a basin with exactly one maritime exit. Every cargo leaving by sea passes the Turkish Straits. The basin has no second door.

That geography has made the Black Sea the most militarily contested commercial waterway in the world since 2022. As of late July 2026, for the first time since Ukraine opened its unilateral corridor in August 2023, traffic on that corridor stopped entirely. No authority closed it. Shipowners simply declined to sail after 28 merchant vessels were struck in a month and 21 seafarers and port workers were killed, according to Odesa regional prosecutors.

The distinction matters for how such episodes end. This is not a blockade in the 2022 sense, with a navy enforcing a cordon. It is a withdrawal of private tonnage, which reverses when risk pricing and crew willingness recover rather than when a treaty is signed.

Key numbers

What moves on Black Sea shipping routes

Grain is the flow with global consequence. Ukraine and Russia together account for roughly 30% of world wheat supply, and almost all of it leaves by sea. In recent harvests Ukraine alone supplied about 6% of global wheat exports and about 11% of corn exports. The Ukrainian corridor alone moved 123.8 million tonnes of grain between August 2023 and August 2026. Russian wheat ships mainly from Novorossiysk and the smaller Azov ports.

Crude oil and refined products form the second flow. Novorossiysk loads Russian Urals, and the adjacent Caspian Pipeline Consortium terminal loads Kazakh CPC Blend, together representing the bulk of the roughly 3.7 mb/d that crosses the Dardanelles. Detail on the Russian side sits in Russian seaborne crude exports; the Kazakh side in CPC pipeline.

Containers and general cargo are smaller but structurally revealing. Constanta in Romania has become the basin's stable hub precisely because it sits in a NATO state with EU rail and Danube connections, handling around 92.7 million tonnes a year and absorbing traffic diverted from Ukrainian ports.

Iron ore, steel and sunflower oil complete the picture on the Ukrainian side, and are the cargoes that suffer first when corridor economics deteriorate, since their freight-to-value ratio tolerates less war risk premium than grain does.

Who depends on Black Sea shipping

Ukraine's dependence is close to existential. About 90% of its agricultural exports move by sea, and agricultural exports are among its largest sources of foreign currency during wartime. When the corridor stops, the loss is not a logistics inconvenience; it is a fiscal event.

Kazakhstan depends on the basin for roughly 80% of its oil exports, which reach the sea only at Novorossiysk. It is the clearest case of a producer with no coastline on open water and no alternative outlet at scale.

Russia's dependence is significant but partial, since Baltic and Pacific ports carry most of its crude. What the Black Sea gives Russia is its shortest route to Mediterranean and Asian buyers, and its principal wheat outlet.

On the buying side, Egypt, Turkey, Bangladesh, Pakistan, Indonesia and much of North and Sub-Saharan Africa depend on Black Sea grain. Their exposure is to price and availability rather than to any single route, which is why corridor interruptions transmit into food-security politics within weeks.

Alternatives and bypass routes

For grain, the alternatives exist and are inadequate. The Danube river ports and EU land corridors, known as the Solidarity Lanes, functioned through earlier interruptions and are functioning now, with two structural limits: capacity well below seaborne volume, and cost per tonne that Ukrainian farmers absorb directly. Low water levels on the Danube during European droughts cut that capacity further, exactly when it is most needed.

Ukraine's own government quantified that shortfall in August 2026: the agriculture minister said alternative routes would reach the needed capacity by the end of August at best, and even then would cover only half the volumes normally moved through Black Sea ports.

Constanta is the practical relief valve, and container lines have used it: Maersk rerouted its feeder service there in July 2026, and other lines followed. It works for containers and for transshipped grain, but it moves the bottleneck to Romanian rail and barge capacity rather than removing it.

For oil, the alternatives are the subject of the Turkish Straits page: the Baku-Tbilisi-Ceyhan pipeline bypasses the basin rather than relieving it, and the purpose-built Samsun-Ceyhan line was never constructed. Russia's own answer in August 2026 was administrative rather than physical, with the Transport Ministry forming a task force with the Defence Ministry to reroute freight and shift cargo to other transit modes.

The honest summary: no alternative absorbs Black Sea volumes. Each interruption redistributes a fraction of the cargo at higher cost and strands the rest.

Historical incidents

Assets and companies exposed

Four groups carry the exposure. Shipowners and operators calling at basin ports face it most directly, and the July and August 2026 strikes hit Greek-controlled tankers, Turkish-owned tonnage and Russian container operators alike; FESCO's withdrawal shows how quickly a single loss removes a service from the market.

Marine war risk underwriters and the London market price the basin continuously, and the move above 1% of hull value reprices every voyage rather than only the vessels struck. Container lines with Black Sea feeder services, notably those that rerouted to Constanta, carry network cost rather than hull risk.

Upstream, the exposure sits with Kazakh producers and CPC shareholders whose barrels have no alternative outlet, and with Ukrainian and Russian agricultural exporters. Downstream, it sits with grain importers in North Africa, the Middle East and South Asia, and with the Romanian rail, barge and port operators absorbing diverted volume.

This page describes exposure. It does not assess securities or recommend positions.

What to watch

Corridor traffic counts, published by the Ukrainian Seaport Authority, are the cleanest single indicator of whether tonnage has returned. War risk quotes in the London marine market, reported weekly, price the campaign before volumes reflect it. Novorossiysk and CPC loading data from Kpler and Vortexa show the Russian and Kazakh side of the same question. Wheat benchmarks in Chicago and on Euronext register interruptions within days, and Russian export forecasts from consultancies such as IKAR translate attacks into tonnage. Finally, container line schedules for Constanta and Chornomorsk reveal whether commercial operators judge the risk to be receding.

FAQ

Is the Black Sea open to shipping? Ports remain legally open, but commercial traffic depends on shipowner willingness rather than legal status. In late July 2026, Ukraine's corridor recorded zero traffic for the first time since 2023 because operators declined to sail after repeated strikes, while Ukrainian officials emphasised that the ports themselves had not closed.

How does Ukraine export grain during the war? Mainly through a unilateral maritime corridor opened in August 2023, which follows the territorial waters of Romania, Bulgaria and Turkey to the Bosporus. It had carried 208.9 million tonnes of cargo including 123.8 million tonnes of grain by August 2026, serving more than 55 countries, with Danube river ports and EU land routes handling the remainder.

What is the war risk premium for Black Sea shipping? Above 1% of a vessel's hull value as of July 2026, with some brokers quoting around 1.5%, up from roughly 0.4% to 0.6% earlier in the year. War risk cover is priced per voyage and repriced continuously, so quotes move within days of an attack.

Which ports handle Black Sea cargo? Novorossiysk is the largest by volume, handling 36.8 million tonnes in the first quarter of 2026. Constanta in Romania is the largest non-Russian port at around 92.7 million tonnes a year and has absorbed diverted traffic. Odesa, Chornomorsk and Pivdennyi form the Ukrainian cluster, with Tuapse, Taman, Varna, Burgas, Poti and Batumi handling regional volumes.

Can Black Sea cargo avoid the region entirely? Not by sea. The Black Sea has one maritime exit, so any alternative means moving cargo overland or by pipeline before it reaches the water. The Danube corridor and EU rail routes carry a fraction of seaborne grain volume at higher cost, and no pipeline alternative exists at the scale of Novorossiysk's oil exports.

Why do attacks on ships matter more than attacks on ports? Ports can operate under bombardment; crews cannot be compelled to sail. Once seafarers are killed, owners withdraw tonnage regardless of insurance availability, which is what produced the July 2026 halt. Recovery therefore depends on perceived crew safety rather than on port repair.