Ukrainian forces attacked a Russian ​oil refinery in Yaroslavl, around 700 km (435 miles) from the Ukrainian border, President Volodymyr Zelensky said on Friday, the ​latest ‌in a series of strikes ⁠by Kyiv on oil facilities in Russia.

“In particular, overnight, the Defence Forces ‌of Ukraine operated against targets associated with the ⁠Yaroslavl oil refinery – about 700 kilometres from our territory,” he said on the Telegram messaging app.

Ukraine ​has intensified its attacks in Russia, ‌aiming to disrupt Russia’s oil industry and slash revenue that helps Moscow fund the war in Ukraine. Global ‌energy prices have risen during the Iran conflict and sanctions on ​Moscow’s oil sales have been eased.

Kyiv has also increasingly adopted the tactic of hitting the same facilities several times.

The ​Ukrainian defence ministry said on X that ​Ukraine hit 11 Russian oil facilities ​this month as of May 21, including one of Russia’s largest refineries ​Kirishi.

Virtually all major oil refineries in central Russia have been forced to halt or scale back fuel output following Ukrainian drone attacks in recent days, official ⁠data showed and sources told Reuters this week.

“We are bringing ⁠the war ​back home – to Russia – and that’s only fair,” Zelensky said.