Firefighters respond to a Russian air attack in Kostiantynivka in the Donetsk region. (Ukrainian Emergency Service via AP)
In short:
Dozens of Russian missiles have attacked key Ukrainian energy infrastructure.
Ukraine launched its own air attacks and used its air defences in the overnight skirmishes.
What's next?
The fighting continues as the US pushes Ukraine to accept a peace deal.
Russia has attacked Ukrainian energy facilities with dozens of missiles and drones, injuring ten people and restricting the country's ability to deliver heat and light to its citizens, and to power weapons factories vital to its defences.
The overnight barrage came days after the US suspended military aid and intelligence to Ukraine in an attempt to pressuring it into accepting a peace deal being pushed by the US president Donald Trump.
American intelligence has been key to Ukraine's ability to defend itself and launch attacks on Russian territory.
Air-defence systems supplied by the West are also crucial for Ukraine, but further US help is uncertain under President Donald Trump, who has repeatedly said he wants a quick peace deal.
Ukrainian emergency services rushed to scenes of destruction across the country. (Ukrainian Emergency Service via AP)
Amid ongoing uncertainty about US support for Ukraine, European Union leaders agreed to a plan on Thursday to significantly build up their military spending.
Officials from the US and Ukraine will meet in Saudi Arabia next week to discuss ending the war, which began when Russia launched a full-scale invasion more than three years ago.
On Friday, local time Trump said on social media that he was "strongly considering" placing additional sanctions on Russia to force it into peace talks with Ukraine.
"To Russia and Ukraine, get to the table right now, before it is too late," Trump said.
Russia accused of 'weaponising winter'
Ukraine came under a "massive missile and drone" attack overnight, Energy Minister Herman Halushchenko wrote on Facebook.
"Russia is trying to hurt ordinary Ukrainians by striking energy and gas production facilities, without abandoning its goal of leaving us without light and heat, and causing the greatest harm to ordinary citizens," Mr Halushchenko wrote.
Russia has repeatedly targeted Ukraine's power grid during the war, depleting electricity generation capacity and disrupted critical heating and water supplies.
Ukrainian officials have accused Russia of "weaponising winter" in an effort to erode civilian morale.
Kremlin spokesman Dmitry Peskov said on Friday that the energy supply is a legitimate target in the war, because it's "linked with Ukraine's military industrial complex and weapons production."
Russian air defences downed 39 Ukrainian drones overnight, according to the Russian Defense Ministry.
Ukrainian emergency services search for people in a building damaged by a Russian missile in Kharkiv. (Ukrainian Emergency Service via AP)
Ukraine's largest private gas producer, DTEK, said that the overnight bombardment in the Odesa region was Russia's sixth attack in the past two weeks on its facilities. Its plants in two other regions were also struck.
Russia fired 67 missiles from air, land and sea, and launched 194 strike and decoy drones, Ukraine's air force said, adding the target was the country's natural gas extraction facilities.
After clash in the Oval Office, what now for Ukraine?
Photo shows Volodymyr Zelenskyy boarding a Ukrainian government plane on stairs.
For the first time, Ukraine deployed French Mirage-2000 warplanes delivered a month ago to help repel the attack, according to the air force. Ukraine also has Western-supplied F-16 fighter jets to shoot down Russian missiles.
Ukrainian defences downed 34 missiles and 100 drones, the air force said, while up to 10 missiles didn't reach their targets and 86 drones were lost from radars, presumably jammed by electronic warfare.
Volodymyr Zelenskyy on Friday won the support of Turkish President Recep Tayyip Erdogan for Ukraine's proposals to take some first steps toward stopping the war, including a halt on firing missiles, drones and bombs at energy and other civilian infrastructure.
Mr Zelenskyy has also proposed ceasing combat operations in the Black Sea to allow safe shipping.
AP/ABC