Nearly half of Kyiv residents were still without electricity today as engineers battled to restore services two days after Russian strikes hammered the country's energy grid.

After nine months of war, Russian President Vladimir Putin met for the first time with women whose children are fighting in Ukraine, assuring those who had lost sons that he and Russia's elite "share this pain".

And in the southern region of Kherson, the governor there said Russian shelling had forced the evacuation of patients from hospitals in the city of Kherson.

The systematic and targeted Russian attacks over recent weeks have brought Ukraine's energy infrastructure to its knees as winter approaches, spurring fears of a health crisis and a further exodus.

Utility workers were still working Friday to reconnect the heating and water as temperatures in Kyiv approached freezing, as UK Foreign Secretary James Cleverly visited to announce a new aid package.

"We have to endure this winter - a winter that everyone will remember," Ukraine President Volodymyr Zelensky said on social media.

"We have to do everything so that we remember it - not because of what it threatened us with - but because of what we managed to do to protect ourselves from this threat."

Ukraine Prime Minister Denys Shmygal told a government meeting that electricity providers were now providing 70% cover.

"Almost all Ukraine's critical infrastructure has been reconnected," he said.

But, he added: "On average, from 200,000 to 400,000 consumers are cut off power in each region at certain hours."

Cars queued outside petrol stations in Kyiv today to stock up, AFP journalists said.

Mobile networks in some areas were still experiencing disruption.

Images from a satellite shows most of Ukraine in darkness (Pic: NASA Worldview)

'We live like this now'

Millions of Ukrainians have endured the cold without power since Russia fired dozens of missiles and launched drone attacks at water and electricity facilities on Wednesday.

"Yes, this is a difficult situation and yes, it can happen again," presidential advisor Mykhailo Podolyak said on television.

"But Ukraine can cope."

With gas for cooking and heating disconnected in her Kyiv apartment, Albina Bilogub told AFP that she and her children all slept in the same room to stay warm.

"In our building, very few people have gas, so we go to the woman that I work for - I change her clothes because she is disabled - and we cook there," she said.

"This is our life. One sweater, a second, a third. We live like this now."

In northern Kyiv, a vet in blue scrubs and a face mask shone a light over an operating table in a darkened clinic as colleagues operated on an ailing dog late yesterday.

"We were in the middle of an operation and our lights turned off because a rocket fell not far away, so there was a power cut," said Oleksiy Yankovenko.

"I had to finish the operation under the flashlights," he added.

Russian President Vladimir Putin meets mothers of soldiers fighting in Ukraine

'Brutal attacks'

Mr Putin meanwhile met the mothers of soldiers fighting in Ukraine at his residence near Moscow.

"I want you to know: I personally and the entire leadership of the country share this pain," he told them.

He warned them that a lot of news reports about the conflict could not be trusted, describing them as "fake news, deceit and lies".

But Russia would achieve its goals in Ukraine, he added.

Yesterday, Ukraine's presidency said Russian shelling had killed 11 people and wounded nearly 50 across the southern Kherson region Thursday.

Today, the region's governor said hospital patients in the city of Kherson had been evacuated to nearby regions because of "constant Russian shelling".

Patients at a psychiatric facility in the region also had to be evacuated.

Ukraine's forces recaptured the city from Russian forces earlier this month.

Russian strikes on Kherson shipyards as Moscow shifts to the tactic of hitting Ukraine's infrastructure

Ukraine's Western allies have denounced the Russian attacks on energy as a "war crime", coming in the wake of a string of military setbacks for Russia on the frontlines.

Moscow insists it targets only military linked infrastructure and has blamed Kyiv for the blackouts, saying Ukraine can end the suffering by agreeing to Russian demands.

Britain's foreign minister announced new aid for Ukraine during his visit to Kyiv, including ambulances and support for victims of sexual violence by Russian soldiers.

"As winter sets in, Russia is continuing to try and break Ukrainian resolve through its brutal attacks on civilians, hospitals and energy infrastructure," Mr Cleverly said.

"Russia will fail," he said, vowing UK support "will continue for as long as it takes".

The attacks on Ukraine's grid are Russia's latest strategy designed to force Ukrainian capitulation after Moscow's forces failed to topple the government and capture Kyiv nine months after launching their invasion.

Although they have captured swathes of territory in the south and east and the Kremlin claimed to annex four regions, Ukrainian troops are clawing back territory.

British Foreign Minister James Cleverly meets Ukrainian President Volodymyr Zelensky

Russian strikes plunging millions into hardship - UN

The UN human rights chief has said that Russian strikes on critical infrastructure in Ukraine since October had killed at least 77 civilians and were plunging millions of people into extreme hardship.

Much of the country remained without heat or power after the most devastating Russian air strikes on its energy grid so far.

Since early October, Russia has launched missiles roughly once a week in a bid to destroy the Ukrainian power grid.

Moscow acknowledges attacking basic infrastructure but denies it targets civilians, saying it aims to reduce Ukraine's ability to fight and push it to negotiate. Kyiv says such attacks are a war crime.

"Millions are being plunged into extreme hardship and appalling conditions of life by these strikes," said Volker Turk in a statement.

"Taken as a whole, this raises serious problems under international humanitarian law, which requires a concrete and direct military advantage for each object attacked."

In the same statement, he said the UN's preliminary analysis of videos that appeared to show Ukrainian soldiers executing Russian prisoners of war indicated they were "highly likely to be authentic".

Kyiv has previously said it would investigate any alleged abuses by its armed forces.

The UN's monitoring team has said that both Russia and Ukraine have tortured prisoners of war.

Mr Turk called on both Russia and Ukraine to issue clear instructions to their forces about the treatment of prisoners of war and said all allegations of summary executions should be investigated fully.

Yesterday marked nine months since Moscow launched what it called a "special military operation" to protect Russian-speakers.

Ukraine and the West say the invasion is an unprovoked war of aggression.

Kremlin spokesperson Dmitry Peskov said it was Kyiv's fault Ukrainians were suffering because it refused to yield to Moscow's demands, which he did not spell out.

Ukraine says it will only stop fighting when all Russian forces have left.

Nuclear officials say interruptions in power can disrupt cooling systems and cause an atomic disaster.

Thousands missing

More than 15,000 people have gone missing during the war in Ukraine, an official in the Kyiv office of the Hague-based International Commission on Missing Persons (ICMP) said.

The ICMP's programme director for Europe, Matthew Holliday, said it was unclear how many people had been forcibly transferred, were being held in detention in Russia, were alive and separated from family members, or had died and been buried in makeshift graves.

In Kyiv, members of the Kyiv National Academic Operetta Theater tearfully bid farewell to 26-year-old ballet dancer Vadym Khlupianets who was killed fighting Russian troops.

Additional reporting Reuters, AFP