Russian drones have again targeted Ukrainian ports in the southern Odesa and Danube regions, causing a fire at a grain warehouse, the Ukrainian military and local authorities said on Wednesday, cited by Reuters. The overnight attacks were the latest in a series in recent weeks targeting port infrastructure on the Danube after Moscow blocked a deal allowing Ukrainian grain to be exported via the Black Sea.

“The enemy struck grain warehouses and a production and transshipment complex in the Dunaev region. A fire broke out in the warehouses, which was quickly extinguished. Firefighters continue their work,” the Ukrainian Army reported on Telegram.

The army released photos showing piles of burned grain in a warehouse.

Odesa Governor Oleg Kiper said that the shelling of the region lasted for three hours, Ukrainian aviation destroyed nine Russian drones.

“Unfortunately, there were attacks on production and transshipment facilities, where there was a fire… Granaries were damaged,” Kiper wrote in Telegram.

Ukrainian ports on the Danube accounted for about a quarter of grain exports before Russia pulled out of a UN-backed deal to ensure safe passage of Ukrainian grain exports through the Black Sea. From then on, they became the main exit route, with grain being transported by barge to the Black Sea port of Constanta for onward shipment.

Earlier this month, Russia attacked Izmail, Ukraine’s main inland port, causing world food prices to skyrocket. Drone strikes destroyed buildings at the port and halted ships preparing to arrive there to load Ukrainian grain, defying the de facto blockade that Russia reimposed in mid-July.

Also, on August 16, Russia attacked with drones the port of Reni on the Danube, located on the border with Romania.