Russian Telegram channels shared videos showing the blaze as drones struck the Ryazan and Voronezh regions overnight.

Ukrainian drones hit a major oil refinery owned by state-controlled Rosneft PJSC in Ryazan, southeast of Moscow, just as the facility’s crude-processing had recovered from a previous strike.

The successful drone attack on Russia's Ryazan oil refinery overnight on May 1 was a special operation of Ukraine's Main Intelligence Directorate (HUR), RBC-Ukraine sources reported.

A Russian oil refinery in the Krasnodar region was impacted by a suspected Ukrainian drone attack on Saturday, according to local officials.

Ukraine is increasing production of long-range drones to help it reach far behind the front line with Russian forces, hitting oil refineries, airfields and logistics.

The Slavyansk refinery in Russia's Krasnodar Krai, which was attacked by Ukrainian drones on 27 April, has been forced to suspend some operations. Source: Kremlin-aligned Russian news agency TASS Details: "The plant's operations have been partially suspended.

The airstrikes by Moscow are the fourth large-scale aerial assault targeting Ukraine’s power system in recent weeks

There may be hidden damage.” The Security Service of Ukraine (SBU) has been transparent about its intentions to “effectively hit military and infrastructure facilities” in Russia in an attempt to curtail Moscow’s “potential for warfare.