At least 25 people were killed in a Russian drone and missile attack overnight that hit apartment buildings in the western Ukrainian city of Ternopil, Ukrainian officials said.
About 80 others were wounded as Russia fired 476 drones and 48 missiles at Ukraine, striking energy and transport infrastructure and forcing emergency power cuts in a number of regions in frigid temperatures.
Officials said three children were among the dead and that the death toll could rise, with about 25 people still missing.
Poland, a Nato member state bordering western Ukraine, temporarily closed Rzeszow and Lublin airports in the southeast of the country and scrambled Polish and allied aircraft as a precaution to safeguard its airspace.