Ust-LugaDrones hit the port, Russian state news agency TASS reported.
The attack came on the second day of US-mediated Russia-Ukraine talks in Abu Dhabi.
Governor Alexander Drozdenko said air defences downed 150 drones, 3 workers were wounded and a transformer substation blacked out.
Drozdenko said officials are still clarifying the damage at the substation.
How each outlet framed it
- TASS
- TASS
- reports the claimed 150 drones downed overnight and the three wounded port workers' condition