Ukraine’s Ministry of Energy said Monday that a Russian overnight attack damaged one of Kiev’s key thermal power generation plants, intensifying pressure on the country’s already fragile energy grid.

“The goal is obvious – to cause even more difficulties for the civilian population of Ukraine, to leave Ukrainian homes, hospitals, kindergartens and schools without electricity and heat. Generation facilities, electricity transmission and distribution systems, gas infrastructure are not military targets,” the ministry said in a statement.

The strike came as part of what Ukrainian officials described as Russia’s largest air assault of the war, launched overnight on Sunday. At least four people were killed when missiles and drones rained down on the capital, igniting fires and causing widespread destruction.

One of the hardest-hit sites was Ukraine’s main government building in central Kiev, which caught fire following the bombardment. Emergency crews worked through the night to contain the blaze and evacuate officials.

The renewed attacks underscore Moscow’s strategy of targeting Ukraine’s energy infrastructure ahead of winter, a move that Kyiv has denounced as a deliberate attempt to cripple essential civilian services.

Ukrainian authorities warned that further rolling blackouts may be required in the coming weeks as power plants and transmission networks remain under constant threat.