Ukraine’s Armed Forces said they conducted a series of strikes overnight into 4 October, claiming hits on an oil refinery in Leningrad Oblast, a small missile ship in Karelia, military equipment in Kursk Oblast, and a command post of Russia’s 8th Combined Arms Army in occupied Donetsk.

The General Staff described the actions as part of ongoing operations against Russian military and logistical targets.

The most substantial claim concerned the Kirishi Refinery (KirishiNefteOrgSintez, often abbreviated as KINEF) in the town of Kirishi, around 115 kilometres east of St Petersburg. Local social media channels reported explosions and a fire at the site during the night. Independent Ukrainian and Russian outlets noted visible flames before authorities said the blaze had been contained. The facility is among Russia’s largest refineries, and has been targeted multiple times since 2024.

Ukrainian sources framed the refinery strike in the context of Kyiv’s wider campaign to degrade Russia’s fuel processing and logistics, which has included repeated long-range drone attacks on refineries and storage nodes across several regions this year. Recent industry reporting suggested that damage-related outages have at times constrained domestic fuel output while diverting crude volumes to export terminals;  the immediate operational impact of the Kirishi strike has not been independently assessed.

In a separate claim, the General Staff reported damage to a Project 21631 Buyan-M small missile ship on Lake Onega in the Republic of Karelia. The extent of damage to the vessel was not specified and is “being clarified”, according to the statement. The Buyan-M class is a carrier of Kalibr cruise missiles and has been used by Russia to strike targets in Ukraine. Similar claims regarding damage to ships of this class have been made earlier in the conflict, including an operation reported in late August in the Azov Sea; the latest incident, if confirmed, would indicate continued Ukrainian efforts to target missile platforms at range.

Additional strikes were reported in Russia’s Kursk Oblast, where Ukrainian forces said they hit a “Garmon” (Harmony) radar complex and a transport-loading vehicle associated with the Iskander short-range ballistic missile system. As with other elements of the overnight operation, battlefield damage assessment was not released publicly, and Russian authorities had not issued corroborating detail at the time of writing. Open-source reporting has previously documented Ukrainian drone activity in the Kursk region, including against military infrastructure.

The General Staff also said a command post of Russia’s 8th Combined Arms Army, located in the occupied part of Donetsk Oblast, was struck. The 8th Army has featured repeatedly in Ukrainian accounts of targeting command-and-control nodes in the east; Ukrainian officials reported a similar hit on an 8th Army site in late June. The present claim did not include casualty figures or imagery, and independent outlets had not verified the effect of the latest strike by mid-day on 4 October.

The overnight actions came amid sustained Russian attacks against Ukrainian energy and industrial infrastructure in recent weeks, including combined missile and drone salvos intended to disrupt power generation and gas processing ahead of winter. Analysts have noted that both sides continue to focus on logistics, command posts and strike platforms in an effort to influence the tempo of operations along the front.

Ukraine has repeatedly stated that strikes on Russian military and logistical assets are intended to reduce Russia’s capacity to conduct missile and drone attacks, constrain supply chains, and compel the redeployment of air-defence resources away from the front line. Russia, for its part, has sought to maintain strike pressure, with recent mass launches targeting energy and gas facilities across several Ukrainian regions.

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