The governor of Russia's ‌Omsk region said on Monday that the western Siberian province had come under attack from Ukrainian drones, in what ‌would be one ​of the longest-ranged Ukrainian strikes since the beginning of ⁠the war.

In a post on ​Telegram, Vitaly Khotsenko said that several drones ⁠had reached what he called "Omsk's northern industrial hub," which is located around ‌2,700 km (1,700 miles) from Ukrainian-held ​territory, close to ‌Russia's border with Kazakhstan.

He said that ‌the consequences of the attack were being clarified, and that emergency services ⁠were working to "liquidate" ‌the ⁠strike's aftermath.

Khotsenko gave no information on ⁠what ⁠had been targeted, but Omsk's northern outskirts play ‌host to Gazpromneft's Omsk refinery, Russia's largest.

Ukraine has been escalating a campaign ‌of ​strikes against Russian ‌oil refineries, causing acute fuel shortages across the country's 11 ​time zones.