Ukraine's army said on Friday that Russia launched 16 Iranian-made kamikaze drones in an overnight attack on the country.
This came a day after Moscow launched a barrage of missiles on Ukrainian cities.
Ukraine's air defense destroyed "all" the 16 drones from the latest attack, Ukrainian officials.
Air raid sirens wailed across the capital at around 2 a.m. local time (0000 GMT) and lasted for two hours.
Kyiv Mayor Vitali Klitschko said the capital was attacked with seven drones, adding that two were shot down "on approach" and five over the city.
There were no immediate reports of casualties. Klitschko said debris damaged windows in two buildings in Kyiv's southwest.
Moscow has targeted Ukraine's energy grid in recent months, leaving millions of Ukrainians without heating or power in the cold winter months.
Ukrainian President Volodymyr Zelenskyy said in his nightly address that most regions of the country were left without power following Thursday's attack.
