Volodymyr Zelenskiy has confirmed that Ukrainian drones attacked an oil refinery in Russia’s Tyumen region ⁠in western Siberia, ⁠more ​than 2,000 km (1,200 miles) from Ukraine. He said Ukrainian company Fire Point had developed new long-range drones capable of ⁠travelling more than 3,000km and they had been “successfully deployed”. In his nightly video address, Zelenskyy thanked the Ukrainian ⁠military for special operations that “have reached Tyumen Region in Russia, including ​an oil refining facility. More ‌than 2,000km from ‌our state border. This is effective work.”

Unverified videos posted online showed smoke and flame rising over what was said to be the burning Tyumen refinery, also known as the Antipinsky refinery. The Tyumen governor, Alexander Moor, claimed emergency services were working at the site of “fallen [drone] debris” – a phrasing often used by Russian officials to play down successful Ukrainian attacks.

Ukraine’s forces struck an oil terminal at Kerch in occupied Crimea over Saturday night, according to Ukrainian media and online accounts monitoring the war. Nasa satellite monitoring showed a fire at the Kerch seaport where the terminal is located. In what appeared to be a broader wave of strikes against Russian-held targets in Crimea, an electrical substation at Bilohorsk was reportedly on fire, and there were other attacks at Yevpatoria and the main city of Sevastopol.