Drones attacked the port infrastructure in the Russian city of Taganrog in Rostov Oblast on the night of 29-30 May, causing a tanker and a fuel storage tank to catch fire, Ukrainska Pravda reports.
An oil depot in Krasnodar Krai has also been hit in the strike.
Explosions were heard in several districts of Taganrog. Local residents reported hearing the sound of drones flying overhead and explosions near the port and the aircraft plant.
Slyusar later confirmed the attack. He reported that "a fire broke out on the territory of the port involving a tanker, a fuel storage tank and an office building" and added that there were no casualties.
He also stated that Russian air defences had downed drones over Taganrog as well as in the Chertkovo, Matveyev Kurgan and Neklinovsky districts of the oblast.
An oil depot belonging to Yuzhnaya Neftyanaya Kompaniya LLC in the city of Armavir, located in Russia's Krasnodar Krai, was also attacked overnight. The extent of the damage at this facility is currently unknown.