Ukraine says Russian hackers sought to attack and disable Ukraine’s electricity grid for a second time last week but were thwarted.

Government spokesman Victor Zhora said on April 12 that the attack was carried out by “a military hacking team,” whose aim was “to disable a number of facilities, including electricity substations.”

“They did not succeed, and we’re investigating,” Zhora said, adding that the attack was likely carried out to support Russia’s current military activities in eastern Ukraine.