We'll soon be wrapping up our coverage, but first let's run through some of today's main headlines coming out of Russia and Ukraine.

• In Belgorod, a region in south-western Russia bordering Ukraine, 18 people were killed, including three children, and a further 111 have been injured
• Russia blamed Ukraine for the strikes. A Ukrainian security source told the BBC that Kyiv fired 70 drones at Russian military targets, but they blamed a failure in Russia's air defences for fragments falling in Belgorod
• The region's governor, Vyacheslav Gladkov, said Saturday's attack was the worst since Russia's invasion of Ukraine in February 2022. In a Telegram post, Gladkov wrote that "shelling by the armed forces of Ukraine has had the most severe consequences of the last two years"
• Earlier, two villages were targeted in the region of Bryansk and a child was killed, the local governor said

• Russia requested an urgent UN Security Council meeting in the wake of events, which is scheduled to take place at 21:00 GMT
• Moscow said it would retaliate and reports of attacks in Ukraine have been coming in throughout the evening. In Kharkiv, 19 people were injured, local authorities said
• Today's events come a day after a Russian bombardment across Ukraine killed 39 people. Those strikes were described by Kyiv as Russia's biggest missile bombardment of the war so far

Today's live coverage was brought to you by Adam Durbin, Laura Gozzi, James FitzGerald, Malu Cursino and Sam Horti.

Read our full story here.

We now have another update from the head of Kharkiv's regional administration, who says at least 19 people, including a foreign national, were injured after Russia launched six rocket attacks on the city.

In a post on Telegram, Oleg Sinegubov said 10 of those injured have been hospitalised and two children are among those hurt.

As well as the Kharkiv Palace Hotel, a residential building in the city's centre was also hit, Sinegubov added.

Russia says it's asked the Czech representative to attend a meeting of the UN Security Council later today "to explain why his country’s ammunition is being used to killing civilians in Belgorod".

Dmitry Polyanskiy - a Russian representative at the UN - was likely referring to a statement made by the Russian defence ministry, which alleged that several Czech-made Vampire rockets were used to attack Belgorod earlier.

In response, the Czech foreign minister said his country would not be summoned "anywhere". He added: "The Czech Republic will not serve the aggressor's propaganda poisoned with lies."

The BBC is not able to verify the Russian claims. It's unlikely that Vampires could reach Belgorod from Ukrainian territory, without modification work to boost the range of the round.

For its part, Ukraine blames the Russian air defence for falling fragments in Belgorod city centre.

Image source, Ostorozhno Novosti/Reuters

Russia's ministry of emergency situations has said that 18 people were killed in today's attack on Belgorod - an increase of four people from the figure that was shared earlier.

The number of injured people was also revised from 108 to 111.

The governor of Belgorod region, Vyacheslav Gladkov, has said that today's attack on Belgorod is the worst since Russia's invasion of Ukraine in February 2022.

"Today, shelling by the armed forces of Ukraine has had the most severe consequences of the last two years," Gladkov wrote in a Telegram post.

"I sincerely offer my deepest condolences to all the families of the victims I understand that there are no words that can ease this grief. I want to say that we are all by your side and that the enemy will not escape retribution."

According to Gladkov, more than 100 vehicles were damaged or destroyed, and 22 residential buildings, as well as shops and shopping centres were damaged. He also said that all public events were cancelled in all municipalities bordering Ukraine.

Image source, Reuters

Russian strikes this evening damaged the Kharkiv Palace Hotel, in the centre of Kharkiv. It is a hotel in which foreign journalists when working from that part of Ukraine.

The mayor of Kharkiv, Igor Terekhov, said a little while ago that the attack on the city resulted in 16 casualties, but no deaths.

Zhanna Bezpiatchuk
BBC Ukrainian

Over three months ago, Ukraine’s military intelligence openly pledged to retaliate if Russia attacked Ukrainian power stations amid the cold of the winter.

But what happened during Russian strikes on Friday went far beyond the previous massive air assaults on Ukrainian power grids - this time the entire country came under the barrage of nearly every type of Russian missiles.

Ukrainian rescuers are still looking for missing people. And the death toll has reached 39 people.

There is the widespread understanding and even consensus in Ukraine that if the Western aid continues to wane, Russia will get a stimulus to carry out more and more assaults of that scale and magnitude.

Air defence weapons which are used to intercept ballistic missiles, for example, can cost millions of dollars. And Ukraine doesn’t have a lot of them.

So, many believe that if Ukraine carries out attacks in retaliation, it won’t face even more danger from Russia. It’s already there.

The governor of Belgorod region, Vyacheslav Gladkov, has given more details on the casualties in Belgorod city.

He says 14 people were killed, including three children, and that 108 people were injured, including 15 children.

Five of them, as well as 12 adults, are in a critical condition, Gladkov adds.

Meanwhile, we're receiving reports of attacks in Ukraine.

The governor of the Kherson region says one person died during Russian shelling of a residential building. "The information is being clarified," Oleksandr Prokudin adds in a post on Telegram.

And in Kharkiv, civilian infrastructure has reportedly been damaged by air strikes. In his own Telegram post, Oleg Sinegubov, the head of the regional administration, accuses Russia of striking "more than six blows".

He says some of these hit central parts of the city of Kharkiv - somewhere we reported shelling a bit earlier. The BBC has verified images of damaged buildings in the city.

As we reported earlier, Russia has requested a meeting of the UN Security Council in the light of events in Belgorod.

Now, Russian news agency TASS is quoting the Russian Permanent Mission to the UN as saying that the meeting will take place at 21:00 GMT.

We're now hearing reports of shelling in the Ukrainian city of Kharkiv, which is near the border with Russia.

According to mayor Igor Terekhov, external, there have been "at least five" blasts in the region.

It follows Russia's promise to retaliate after Ukrainian strikes hit the city of Belgorod on Saturday, killing 14 people.

Kharkiv and Belgorod are roughly 80km (50 miles) apart, on other sides of the border.

We'll bring you the latest as soon as we have it.

Image source, EPA

As we've been reporting, a source in the Ukrainian security services has told the BBC that Kyiv's forces were behind today's attacks in the Russian city of Belgorod.

The source said that Ukraine had launched 70 drones into Russia on Saturday in response to a huge wave of Russian strikes on Ukraine on Friday. They added that Ukraine was strictly targeting military infrastructure, and blamed "incompetent work of Russian air defence" for civilian casualties.

Intense Russian shelling on Friday hit several civilian targets across Ukraine, with more than 150 missiles and drones fired at Kyiv, Lviv, Odesa, Zaporizhzhia, Dnipro and Kharkiv.

Ukraine's air force said it had never seen so many missiles launched at once.

According to Ukrainian President Volodymyr Zelensky, at least 39 people were killed in Friday's strikes, while at least 159 others were injured.

The governor of the Dnipropetrovsk region, Serhiy Lysak, said a shopping centre and a maternity hospital were targeted in the regional capital of Dnipro.

Meanwhile in Zaporizhzhia, eight people were killed after attacks on infrastructure, and 13 people were injured.

In Lviv, which is 80km (50 miles) from Ukraine's border with Poland, schools and nursery were damaged by air strikes.

Paul Brown
BBC Verify

Videos from one of today’s strikes on Belgorod show victims - including possible fatalities - in the city centre. The BBC is choosing not to show the footage, but we have verified the location.

Both videos show a busy street next to a cinema. One clip shows a pile-up of cars, some of which are on fire, and at least one person lying motionless on the road.

The sound of loud bangs and car horns can be heard throughout. Before thick black smoke obscures the scene, we see somebody running to assist the person lying on the road.

A second clip, taken around 50m away, shows more people lying on the ground. One is covered in an orange sheet - another is seen receiving CPR. Glass and debris can be seen in the street.

Other footage we have verified shows damage to buildings in several other locations around the city centre, indicating multiple strikes.

Maria Lvova-Belova, Russia's children's rights commissioner, says that four children are currently in intensive care in a "serious condition" in a Belgorod hospital, and that a total of 17 children were injured.

As a reminder, Russia says that two children are among 14 people that have died.

The International Criminal Court has previously issued an arrest warrant for Ms Lvova-Belova, over the removal of children from Ukraine to Russia.

We've been reporting on a series of strikes on the Russian city of Belgorod, where authorities say 14 people have died.

The city is located approximately 25 miles (40km) north of the border with Ukraine, as the map below shows.

It is 80km away from the Ukrainian city of Kharkiv - which is one of the cities attacked by Russia on Friday in a wave of strikes that killed 39 people.

Today is not the first time Russia has accused Ukraine of striking Belgorod. In August, for example, it said three people died on a Ukrainian drone strike in the city, and in June, two women died in Ukrainian shelling.

A source in Ukraine's security services has confirmed to the BBC that Kyiv was behind today's attack - but said Ukraine was targeting military infrastructure.

In the last half-hour, Kremlin spokeswoman Maria Zakharova spoke to Russian news agency Tass about the attack in Belgorod. Here is a quick summary of what she said:

• Russia has requested a meeting of the UN Security Council in the wake of events in Belgorod. (Russia has a powerful role on the council as a permanent member)

• Britain and the United States are culpable for the "terrorist attack" on Belgorod because they "incite the Kyiv regime to carry out terrorist actions", she claims
• EU countries that supply weapons to Ukraine are also responsible, she says

Today's strikes in Belgorod mark one of the deadliest days of attacks within Russia since it invaded Ukraine.

Such Ukrainian attacks on Russia are not rare, but they have typically killed fewer people.

For instance, in October, three people were killed when debris from a destroyed Ukrainian drone fell on Belgorod homes, while Ukrainian shelling killed two women in the Belgorod region in June.

A source within the Ukrainian security services has told the BBC that Kyiv's forces were behind Saturday's attacks in Belgorod.

The source said they were strictly targeting military infrastructure, and blamed the "incompetent work of Russian air defence" for civilian casualties.

Ukraine's attacks began yesterday evening, he said.

The source said Ukraine launched more than 70 drones against targets across Russia, saying they were a "response to Russia's terrorist attacks on Ukrainian cities and civilians".

Earlier, we brought you verified dashcam video showing an explosion in the Russian city of Belgorod, where authorities say 14 people have died in Ukrainian strikes.

We're also seeing images appearing to show the aftermath of strikes. They show damaged buildings and firefighters tackling flames, as well as debris strewn across the streets.

Image source, Reuters

Image source, Reuters

Image source, Reuters

A Ukrainian media report, citing a security source, says Kyiv fired at military targets in Russia's Belgorod region, but "due to unprofessional actions by Russian air defence", fragments of munitions fell in the city centre.

Website Pravda quotes the source, external as saying that "deliberate and planned provocations" on the part of Russia were also to blame.

The source was also quoted as saying that Ukrainian forces were attacking in response to Russian strikes on Ukraine yesterday, which killed at least 39 people, according to President Zelensky.

Russia earlier said that several Ukrainian rockets and cluster parts from shot-down missiles had hit Belgorod, killing 14 people and injuring more than 100.