A major oil refinery in southern Russia has been set ablaze following a heavy drone assault by Ukraine, Russian authorities confirmed on Sunday.

The attack resulted in at least two fatalities and marks a significant escalation in Kyiv’s campaign against Moscow’s energy infrastructure.

President Vladimir Putin acknowledged the severity of the situation, describing the current phase as a "difficult period" for the country.

The strike underscores the growing vulnerability of Russian processing capacity to long-range drone strikes, a tactic Ukraine has increasingly employed to disrupt energy exports and domestic supply chains.

This development follows a recent pattern of intensified Ukrainian operations targeting Russian energy assets.

Handelsavisen previously reported that Ukraine claimed responsibility for a drone strike on an oil refinery in Moscow, marking one of the most significant attacks on the capital’s energy infrastructure since the war began.