Russia hit key infrastructure in and around Kyiv in a "kamikaze" drone attack on Monday, hours before President Vladimir Putin arrived in Belarus, fuelling fears he will pressure his ally to join a new offensive on Ukraine.
The Ukrainian Air Force said its air defences shot down 30 drones in what was the third Russian air strike on the Ukrainian capital in six days and the latest in a series of assaults since October targeting the Ukrainian energy grid, causing sweeping blackouts amid sub-zero temperatures.
Officials said at least three people were injured and nine buildings damaged in the Kyiv region.
The Ukrainian atomic energy agency accused Russia of sending one of the drones over part of the South Ukraine Nuclear Power Plant in the Mykolaiv region.
"This is an absolutely unacceptable violation of nuclear and radiation safety," Energoatom wrote on Telegram.
Invading Russian forces now occupy the Zaporizhzhia nuclear reactor complex, Europe's largest, in southeastern Ukraine near the front line.
"Kamikaze" drones used in the attacks are cheaply produced, disposable unmanned aircraft that fly towards their target before plummeting at speed and detonating on impact.
A witness said that during the night a fire raged at an energy facility in the often-targeted Shevchenkivskyi district of central Kyiv.
The Solomianskyi district in the western part of Kyiv, a busy transport hub, home to a train station and one of the city's two passenger airports, was also hit.
Kyiv officials said 18 out of 23 drones were shot down over the city of 3.6 million people.
"As a result of the attack on the capital, critical infrastructure facilities were damaged," Mayor Vitali Klitschko said on the Telegram messaging app. "Engineers are working to quickly stabilise the situation with energy and heat supply."
Oleskiy Kuleba, governor of the region surrounding Kyiv, said infrastructure and private homes were damaged and two people were injured. He said three areas had been left without power.
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Putin and Lukashenko meet in Belarus
To the northwest of Ukraine, there has been constant Russian and Belarusian military activity for months in Belarus, a close Kremlin ally that Moscow's troops used as a launch pad for their abortive attack on Kyiv in February.
Russian President Vladimir Putin and his Belarusian counterpart extolled ever-closer ties today as Mr Putin visited Minsk for the first time since 2019, hardly mentioning the war raging in nearby Ukraine at a joint news conference.
But none of the journalists invited to speak asked Mr Putin or Belarusian President Alexander Lukashenko about the war.
Russian troops that moved to Belarus in October will conduct battalion tactical exercises, Russia's Interfax news agency reported, citing the defence ministry. It was not immediately clear when they would start.
Zelensky urges West to provide better combat weapons
Ukrainian President Volodymyr Zelensky said the armed forces were holding firm in the town of Bakhmut - scene of the fiercest fighting for many weeks as Russia attempts to advance in eastern Ukraine's Donetsk province.
"We control the town even though the occupiers are doing everything so that no undamaged wall will remain standing," he said.
Today, Mr Zelensky appealed to Western leaders meeting in Latvia to supply a wide range of weapons systems especially modern battle tanks, air defence systems and artillery.
Mr Zelensky said in his address by video link that the drones used in Monday's strikes were part of a new batch of around 250 acquired by Russia from Iran. Iran has acknowledged supplying Moscow with drones but said this was before the invasion.
Denis Pushilin, Russian-installed administrator of the part of the Donetsk region controlled by Moscow, said Ukrainian forces shelled a hospital in Donetsk city, killing one person and injuring several others.
Russia's defence ministry said that over the past 24 hours its forces had shot down four US-made HARM anti-radiation missiles over the Belgorod region bordering Ukraine, state-run TASS news agency reported.
Reuters could not independently verify the battlefield accounts.
Mr Putin casts what he calls Russia's "special military operation" in Ukraine as the moment when Moscow finally stood up to the US-led Western bloc seeking to capitalise on the 1991 fall of the Soviet Union by destroying Russia.
Kyiv and the West say his assertion is nonsense and that Mr Putin has no justification for what they see as an imperial-style war to reassert dominance over Russia's fellow ex-Soviet republic and put Moscow in control of around a fifth of Ukraine.
