The governor of Kyiv, Oleksiy Kuleba, announced that the region is under a new drone attack.
Sirens sounded in the early hours of Friday morning, and the authorities called on residents to go to shelters.
Reuters reported that several explosions were heard at a distance of 20 kilometers south of Kyiv, and the sound of anti-aircraft guns was also heard.
At around 2 am local time, the capital authorities issued a warning to residents via the Telegram platform, calling for them to go to shelters.
For his part, Kyiv Mayor Vitali Klitschko said that the Ukrainian defenses shot down 7 drones launched by the Russians towards the capital.
This came after the Russian bombing of Ukrainian cities yesterday, Thursday, which was described as one of the largest missile attacks since the start of the war last February.
Ukrainian President Volodymyr Zelensky said - in a video speech on Thursday evening - that electricity was cut off in most regions of the country due to the attack, especially the capital, and in Odessa and Kherson (south) and Lviv (west).
Zelensky stated that the Ukrainian defenses intercepted 54 missiles and 11 drones.
Officials had earlier said more than 120 missiles were fired at Ukraine in Thursday's attack.
The Ukrainian Air Force said that the country was subjected to the most violent attack in weeks from various sides, with cruise missiles from the air and sea, from strategic planes and ships.
And the Ukrainian Ministry of Defense announced - in a statement - that more than 18 residential buildings and 10 basic infrastructure facilities were destroyed in the recent attacks.
See Ukrainian intelligence
Meanwhile, the head of the intelligence department of the Ukrainian Ministry of Defense, General Kirillo Budanov - said - in an interview with the BBC - that the fighting in December between the Russian and Ukrainian armies had reached a "stalemate".
Budanov explained that both sides suffer from a shortage of numbers and equipment, and that the Ukrainian army is not able to defeat Russia completely and on all fronts at the present time, and that the matter depends on the military aid that Ukraine will receive from its allies.
And the Ukrainian General Staff announced this morning, Friday, that its forces continued to bomb the positions of the Russian forces in Zaporizhia province (south of the country), and said that the bombing of the Berdyansk region in the province led to the death of about 50 Russian soldiers.
"legitimate" attacks
On the other hand, NATO Secretary-General Jens Stoltenberg said - in an interview with the German News Agency - that he believes that the recent Ukrainian attacks on military targets in Russia are completely legitimate.
"Every country has the right to defend itself, and so does Ukraine," Stoltenberg added, stressing that the Ukrainian attacks must be seen in context.
On Thursday, Russia announced the interception of a Ukrainian drone near the Russian Air Force Base of Engels, which is located near the city of Saratov, 730 km southeast of Moscow.
This is the third incident of its kind within one month in the vicinity of this Russian base, which is known to include strategic bombers and devices designed to hit high-importance targets.
In the same context, on Thursday, Russian media published pictures that it said showed the air defenses responding to the bombing of the Russian city of Belgorod.
For his part, the Secretary-General of NATO called for sending more weapons to Ukraine, and said, "It may seem paradoxical, but military support for Ukraine is the fastest way to peace," adding that Russian President Vladimir Putin must be convinced that he will not achieve his goal of controlling Ukraine.
Stoltenberg stated that there could be a "peaceful, negotiated solution that guarantees Ukraine's sovereignty as an independent democratic state".
Regarding his opinion on the possibility of providing Ukraine with medium-range missiles, Stoltenberg said that there is "an ongoing dialogue between the allies and Ukraine about specific systems."
On the other hand, Britain said it had given Ukraine more than 1,000 metal detectors and 100 bomb-defusing equipment to help clear minefields.
"Russia's use of landmines and the targeting of civilian infrastructure underscores the appalling cruelty of Putin's invasion," British Defense Secretary Ben Wallace said Friday in a statement.
"This latest package of UK support will help Ukraine safely clear land and buildings as it reclaims its territory," he added.
Ben Wallace said Thursday that Britain will allocate 2.3 billion pounds ($2.77 billion) in military aid to Ukraine in 2023, which is the same amount it gave this year.