Russia carried out a “massive” missile attack on Ukrainian energy infrastructure overnight into Wednesday, according to local authorities, in the biggest aerial onslaught by Russian forces for weeks.

Russia used 76 air attack weapons in the assault, including 55 missiles and 21 drones launched from Russia and Russian controlled areas, according to Ukrainian Air Force Commander Mykola Oleshchuk. At least 59 weapons were destroyed overnight, he added.

The attacks targeted power generation and transmission facilities in Ukraine’s Poltava, Kirovohrad, Zaporizhzhia, Lviv, Ivano-Frankivsk and Vinnytsia regions, the country’s Energy Minister Herman Halushchenko posted on Telegram.