A fresh aerial strike targeted Kyiv in the early hours of Monday, after a New Year's day marked by dozens of Russian assaults that killed at least four people in the capital and other cities.
The Ukrainian capital and other cities came under fire from missiles and Iranian-made drones on Saturday, killing three people, and a new attack Sunday killed one in the southern region of Zaporizhzhia.
The capital was once again rocked by an air raid on Monday morning, with the city's military administration ordering residents just after 1:00 am local time (2300 GMT) to retreat to bomb shelters.
"The air defence (system) is working. As of this minute, 16 air targets already have been shot down over the capital," it announced on the messaging app Telegram. "The air alert continues, stay in shelters!"
Mayor Vitali Klitschko reported an explosion in Kyiv's northeastern Desnyanskyi district and said emergency services had been dispatched.
"An injured 19-year-old man was hospitalised in the Desnyanskyi district of the capital," he said.
Russia's New Year attacks had targeted downtown areas of large cities, said Mykhailo Podolyak, an adviser to Ukrainian President Volodymyr Zelensky.
Podolyak said the attacks showed a change in Moscow's tactics.
"Russia no longer has any military goals and is trying to kill as many civilians as possible and destroy more civilian facilities," he tweeted.
"A war to kill."
The attacks came as President Vladimir Putin's invasion of Ukraine enters its 11th month.
From the New Year's attacks, local governors and officials reported one death each in Orikhiv in the Zaporizhzhia region; in the capital Kyiv; in the southern region of Kherson and in the western city of Khmelnytskyi.
In addition, dozens of people were wounded, they said.
- Hospital strike -
On New Year's Eve, Russian artillery hit the village of Naddniprianske outside the city of Kherson, severely wounding a 13-year-old boy, Yaroslav.
Then the Russian army struck the hospital where the boy was lying in intensive care, smashing the windows in the ward.
"What did the 13-year-old boy do to these inhumans that they tried to kill him twice?" governor Yaroslav Yanushevych said on messaging app Telegram.
The Russian onslaught damaged the Kherson hospital and also left the city and the surrounding settlements without electricity.
Russian forces in November withdrew from Kherson, the only regional capital held by Moscow, but have continued to batter the city.
The Ukrainian air force said 45 Iranian-made drones had been destroyed during the night between Saturday and Sunday.
Thirteen were shot down at the end of 2022 and another 32 after midnight.
"Thanks to our air force -- pilots, anti-aircraft gunners. Thirty-three 'Shahed' (drones) on their tally," Zelensky said in his nightly address.
"Thanks to the air defence of our ground forces for another 12 downed Iranian drones. Well done, guys!"
Kyiv police chief Andriy Nebitov released a picture of the wreckage of a downed drone that featured the words "Happy New Year" in Russian.
In the eastern region of Donetsk, pro-Russian officials said Ukrainian shelling had killed a civilian in the town of Yasynuvata.
After a series of military defeats, Russia in October began targeting Ukraine's infrastructure, leaving millions in the cold and dark.
"Moral, historical rightness is on our side," Putin declared as he delivered his midnight address on New Year's eve, standing among men and women dressed in military uniform.
But in France, the archbishop of Marseille, Jean-Marc Aveline, used a New Year's Day address to attack the "frightening cynicism" of Russia's campaign in Ukraine.
- 'Terror attacks' -
Moscow said on Sunday its New Year attacks had targeted the pro-Western country's drone production.
Russia's defence ministry said a strike hit sites involved in the production, storage and deployment of drones.
"The plans of the Kyiv regime to carry out terror attacks against Russia in the near future have been thwarted," the ministry said.
Russia has accused Ukraine of targeting its domestic military sites and infrastructure.
Russian forces on Thursday shot down a drone near Engels, a base for Russia's strategic aircraft, located hundreds of kilometres from Ukraine's border.
Russia said on Monday it had downed another drone over Engels airfield and that falling debris killed three people.
In early December, Moscow said Ukraine's Soviet-made drones had attacked that base and another in the Ryazan region, killing three people.
Kyiv has a policy of not claiming responsibility for such raids.