Romanian authorities recovered drone fragments in the south-eastern city of Galati following the overnight attack, which left an electricity pole and a household annex damaged, according to the Defence Ministry.
Emergency services later evacuated the area over fears the fragments could contain an explosive.
While drone fragments have routinely fallen on Romania, a member of Nato which shares a 643km land border with Ukraine, it marked the first time property had been damaged.
Romanian law allows it to shoot down drones during peacetime if lives or property are at risk, but it has not yet done so.
Radu Miruta, the Romanian Defence Minister, said that a United States-made, AI-powered counter-drone system would be integrated into national air defence systems in a matter of days after final tests.
The Merops system, developed by Project Eagle, would be able to counter drone threats along the Danube, as occurs in Poland already.
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