The Ukrainian military said that Iranian-made attack drones have been used to strike the port of Odesa, the main outlet for the export of Ukrainian grain under an agreement reached in July.
The Ukrainian military's Operational Command South said on Telegram that "Odesa was attacked by kamikaze drones from the sea."
US officials have previously said that Russia bought Iranian-made drones.
According to the military, "two drones destroyed the administrative building in the port area, rescue services are extinguishing a fire."
Serhii Bratchuk, spokesperson of the Odesa region civil military administration, confirmed that two of the drones hit the administrative building near the port, killing at least one person.
Operational Command South said the blast damaged several surrounding buildings.
One Shahed-136 drone was shot down over the sea by air defense forces, according to the military.
In a second attack Friday, four Iranian-made drones approaching the city of Odesa were shot down, Operational Command South said.
The military also said air defenses had shot down a Russian Su-25 attack aircraft in the Beryslav district of the Kherson region.
Some background: CNN reported late last month that the United States assessed Russia was in possession of weapons-capable Iranian drones that they would likely deploy on the battlefield in Ukraine.
Russian operatives began training on the drones in Iran late in July. Russia then purchased and transferred the Mohajer-6 and Shahed-series drones — the Shahed-129 and Shahed-191— to Russia, according to US officials.