Ukraine attacked a power substation in Russian-occupied Crimea, an oil depot and railway station in Russia’s Black Sea port of Novorossiysk and an oil refinery in the port town of Tuapse overnight, a Kyiv intelligence source told Reuters.

Kyiv has stepped up strikes on energy facilities deep inside Russian territory, which
they say are legitimate military targets supporting Moscow’s 27-month-old war in Ukraine.

Attacks have led to disruptions in refining capacity. Reuters calculations on April 15 showed that Russia had been able to repair some key oil refineries, reducing idled capacity to about 10 per cent from almost 14 per cent at the end of March.

Friday’s strikes were a joint operation conducted by the Security Service of Ukraine (SBU) and the HUR military intelligence agency, the source added.

Ukraine launched drones at a refinery in Tuapse, which was already being repaired following an earlier strike, according to the source.

“After the new explosions, they will have to start repairs again,” the source said.