(Bloomberg) — Black Sea grain exports are facing fresh constraints as record-low Danube levels restrict flows through Romania just as escalating Russian strikes divert Ukrainian grain from Odesa and other ports. The Black Sea is the primary export gateway for Russia and Ukraine, the two agricultural powerhouses that together account for more than a quarter of global wheat exports. That’s making river freight pricier, with a knock-on effect that’s adding costs and delays to road and rail transportation just when the Black Sea export corridor needs backup. The Solidarity Lane project was launched by the European Commission in 2022 to help establish alternatives to Black Sea shipping routes for Ukrainian agricultural exports. Still, the railway combined with the Danube river route can only transport a third of the capacity of Ukraine’s Black Sea ports, according to Agrarian Minister Taras Vysotskyi.