Kyiv has hit several Russian energy sites in long-range drone strikes it says are in retaliation for Moscow’s missile attacks that have crippled Ukraine’s energy grid and cut off power to millions at various points in the three-year conflict.

The governor of Russia’s Ryazan region, Pavel Malkov, said on Telegram that a “fire broke out on the territory of an enterprise due to falling debris” after the drones were downed.

The Russian defence ministry said it shot down 22 Ukrainian drones overnight, including two over the Ryazan region, southeast of Moscow.

Telegram accounts, including the Baza channel which is close to the Russian security forces, said the blaze was at an oil refinery.

Local media reported it was the third time the site, owned by Russian oil giant Rosneft, had been hit this year.