Today, Russia launched a major air attack on Ukraine, which aims to disable the country's power system, the Ukrainian Minister of Energy said.
The Russian army targeted the Ukrainian power grid, Minister Herman Halushchenko wrote on his Facebook page.
"The enemy continues his terror," he said.
Halushchenko said workers were doing everything necessary to "minimize negative consequences for the energy system," promising to release more details about the damage when the security situation allows.
The Ukrainian Air Force reported that multiple drones were launched into Ukraine overnight, followed by swarms of cruise missiles.
Russia is also said to have used air-to-air Kinzhal ballistic missiles in an attack on the western region of Ukraine.
Today's attack is one in a series that have heightened fears that the Kremlin is aiming to destroy Ukraine's power generation capacity.
Since launching its invasion in February 2022, Russia has relentlessly attacked Ukraine's electricity system, resulting in repeated blackouts of heating and drinking water supplies during the winter months in an apparent attempt to break Ukraine's spirit.
Moscow said the attacks were aimed at disrupting Ukraine's defense industry, preventing the production of missiles, drones, armored vehicles and artillery.
A similar attack on November 28 involved about 200 missiles and drones and left more than a million households without power. Ukrainian officials have warned that Russia is stockpiling cruise and ballistic missiles for further attacks.
On November 21, Russia used a medium-range hypersonic ballistic missile for the first time to hit an industrial facility in the eastern Ukrainian city of Dnipro.
Russian President Vladimir Putin said that the Oreshnik missile attack was retaliation for Ukrainian strikes on Russian territory with longer-range Western weapons. He stated that new attacks could follow.
On Wednesday, the Russian Defense Ministry said that Ukraine attacked an air base in Taganrog in the southern Rostov region with six US-supplied missiles, injuring several soldiers and damaging several buildings and vehicles.
The Pentagon warned on Wednesday that Russia could soon use new missiles against Ukraine.
Half of Ukraine's energy infrastructure was destroyed during the nearly three-year war with Russia, and power outages are frequent.
Bonus video: