KYIV, Ukraine — Russian drones on Wednesday hit a Ukrainian port city along the border with Romania, causing significant damage and a huge fire at facilities that are key to Ukrainian grain exports.

       The attacks followed the end of a deal with Russia that had allowed Ukrainian shipments to world markets from the Black Sea port of Odesa. Since scrapping the deal, Russia has hammered the country’s ports with strikes, compounding the blow to the key industry. In the past two weeks, dozens of drones and missile attacks have targeted the port of Odesa and the region’s river ports, which are being used as alternative routes.

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       The head of the Ukrainian president’s office, Andriy Yermak, said the city of Izmail, on the Danube River that forms part of the Ukraine-Romania border, was hit in the strikes.