Ukrainian authorities in the west of the country on Wednesday said that critical infrastructure facilities had been targeted in a "massive" Russian missile attack.

"Critical infrastructure facilities were targeted in Prykarpattia," the regional governor of the western Ivano-Frankivsk region wrote on social media.

"Air defence forces were working in the region," the official, Svitlana Onyshchuk, said, adding there were no casualties and that the situation was "under control."

Authorities in the western Lviv region, which borders EU and Nato member Poland, said two critical infrastructure facilities had been hit in the Drogobych and Stryi districts, without elaborating.

"Fortunately, there were no casualties, but there was damage," governor Maksym Kozytsky wrote on social media.

The Ukrainian national grid operator meanwhile announced it was introducing emergency blackouts in seven regions including the eastern Donetsk region.

The apparent barrage came just one day after Ukraine said it had carried out its largest aerial attack on Russian territory, hitting factories and energy hubs hundreds of miles from the front line.

Russia's Defence Ministry confirmed the attack on Tuesday, accusing Ukraine of using US- and British-made long-range missiles and drones.

In a statement on Wednesday, the ministry said that its forces had "carried out a group strike with precision-guided weapons and attack drones against critical gas and energy infrastructure supporting the work of Ukraine's military-industrial complex." (Agencies)