3:58
Moscow's surrender window begins
A satellite image shows a heavily industrialised area on the coast
Copyright: Maxar via Reuters
Image caption: Ukrainian troops are thought to be mostly isolated to the heavy industry region of the Azovstal steelworks
Russia has said it will guarantee the lives of Ukrainian soldiers in Mariupol who surrender in the coming hours.
From 06:00 Moscow time (03:00 GMT or 04:00 BST) and for several hours after, Russian forces have said they will allow soldiers to leave the stronghold of the Azovstal steelworks - provided they leave their weapons and ammunition behind.
Those who do will be treated in line with the Geneva convention on prisoners of war, a statement from Russia's defence ministry said.
The statement, issued hours ago, said Russian forces have been broadcasting details of the deal to their Ukrainian counterparts every 30 minutes overnight.
If they accept, Russia says, Russian forces will raise red flags at 06:00 and Ukrainians should raise white flags around the perimeter of the steelworks.
Ukrainian officials have given no sign that they plan to accept the offer.
4:38
Putin could use nuclear weapons: Khrushchev’s great-granddaughter
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Video caption: Ukraine war: Nuclear weapons possibility for Putin - professorUkraine war: Nuclear weapons possibility for Putin - professor
The great-granddaughter of the former Soviet leader, Nikita Khrushchev, has warned that Russia may be prepared to use nuclear weapons in Ukraine.
Nina Khrushcheva, a professor of international affairs in the US, told the BBC that she believes Russian President Vladimir Putin will eventually do whatever it takes to claim victory in the war.
“I think this war is really the one that Putin plans to win, and plans to win at any cost. If he needs to declare victory and he may need to use tactical nuclear weapons - I’m not predicting that - that could be one of the options the Russians may be prepared to use,” she said.
Tactical nuclear weapons are less powerful than the longer-range missiles that loomed over the Cold War era when Nikita Khruschev led the Soviet Union.
But Ms Khrushcheva - a Russia scholar at the New School in New York and long-time critic of Mr Putin - fears Moscow could use them to devastating effect on Ukrainian soil.
In March, days after Russia invaded Ukraine, Ms Khrushcheva had said she was embarrassed by the development and that her great-grandfather would have found the attack "despicable".
5:30
Reports of explosions in Kyiv
Explosions have been heard in the capital Kyiv, Reuters news agency reports, though the cause is not clear.
Yesterday, one person was killed and several others were wounded in air strikes on the city.
Meanwhile, local media outlet the Kyiv Independent says that air raid alerts were issued in almost every Ukrainian region in the early hours.
7:21
US military assistance starts arriving in Ukraine - reports
Some shipments of military assistance from the US have started arriving in Ukraine, according to a White House official quoted by CNN.
Earlier this week, President Joe Biden approved an additional $800m (£600m) worth of military aid to Ukraine.
He said the support would include new weapons tailored to combat Russia's expected "wider assault" in the east.
The extra $800m shipment means the US has pledged to provided more than $3bn (£2.3bn) in military assistance to Ukraine under the Biden administration.
7:48
Russia may have shifted forces but not aims - UK MoD
Russia's aims of asserting its regional dominance and getting Ukraine to abandon its "Euro-Atlantic orientation" remain the same, despite its move towards concentrating its attacks on eastern Ukraine, according to the UK Ministry of Defence.
In its latest intelligence update, it said that Russian forces continued to redeploy combat and support equipment from Belarus towards eastern Ukraine - including locations close to Kharkiv and Severdonetsk.
It adds that locations throughout the east of the country continue to be struck.
8:06
Explosions hit infrastructure on Kyiv's outskirts - mayor
More information has come in on the explosions heard in Kyiv this morning.
According to the local mayor, infrastructure in the Brovary area, on the outskirts of Kyiv, was damaged during the strikes.
Mayor Igor Sapozhko gave no details of whether there were any casualties or any significant damage caused.
8:30
Why capturing Mariupol is key to Russia’s plans
After a devastating assault over six weeks, there are growing signs that Russia is close to fully capturing the port city of Mariupol.
Thousands of people have been killed in the siege, which began when Russian troops started encircling the city in early March.
But why is Mariupol so important to Russia’s plans? The BBC’s security correspondent Frank Gardner has broken down the reasons:
Securing a land corridor between Crimea and Donbas
Geographically, Mariupol occupies only a tiny area on the map but it stands in the way of Russian forces from the Crimean peninsula. Securing the city will allow Russia to build a land bridge from Russia to Crimea, a major strategic and military success.
Strangling Ukraine's economy
Mariupol is the biggest port in the Azov Sea region and home to a major iron and steel works. It was also a key export hub for Ukraine's steel, coal and corn. Losing it would be a major blow to what is left of Ukraine's economy.
Propaganda opportunity
Mariupol is home to a Ukrainian militia unit called the Azov Brigade, which contains far-right extremists, historically including neo-Nazis. Although they form only a fraction of Ukraine's fighting forces, this has been a useful propaganda tool for Moscow. If Russia manages to capture alive enough Azov Brigade fighters they may be paraded on Russian state-controlled media to discredit the Ukraine government.
Major morale boost
President Vladimir Putin sees Ukraine's Black Sea coastline as belonging to something called Novorossiya (New Russia) - Russian lands that date back to the 18th Century empire.
Putin wants to revive that concept, "rescuing Russians from the tyranny of a pro-western government in Kyiv" as he sees it. Mariupol currently stands in the way of him achieving that aim.
9:27
Russian forces hit ammunition factory near Kyiv, says Russia
Russian Defence Ministry spokesman Igor Konashenkov said Russian armed forces destroyed an ammunition factory near Kyiv, according to Reuters.
Earlier on, there were reports of explosions in Ukraine's capital Kyiv. But there is limited information on where they took place.
Konashenkov said: "Overnight, high-precision air-launched missiles destroyed an ammunition factory near the town of Brovary in Kyiv region".
11:00
Another Russian general reported dead
The deputy commander of the 8th army of Russia's armed forces, Vladimir Petrovich Frolov, has died in the war in Ukraine, the Russian news agency TASS has reported.
The news was confirmed by St Petersburg governor Alexander Beglov. Beglov said: "Vladimir Petrovich Frolov died a heroic death in battle with Ukrainian nationalists."
The governor said Frolov "sacrificed his life so that children, women and the elderly in the Donbas would no longer hear bomb explosions. To stop waiting for death and leaving home, to say goodbye as if it were the last time".
But most of the shelling taking place in Ukraine is being carried out by Russia.
Throughout the war several Russian generals and high-ranking military personnel have been reported dead. It is unusual for such high-ranking officers to put themselves in danger by getting so close to the battlefield, and Western sources believe that they have done so in order to get some control over operations which have, in some areas, badly stalled.
11:53
Ukrainian soldiers in Mariupol 'will not surrender', says Ukrainian MP
Ukrainian MP for Odesa Oleksiy Goncharenko tells the BBC that Ukrainian soldiers in Mariupol won't surrender to Russia.
"I spoke with them yesterday, and I know that they're going to fight until the end," he says.
Ukraine's President Volodymyr Zelensky said that eliminating Ukrainian fighters in Mariupol would put an end to peace talks to end the war.
Russia said it would guarantee the lives of Ukrainian soldiers who would surrender, with the Kremlin adding that the only Ukrainian soldiers left in the city were at a giant steelworks.
Goncharenko said the situation in Mariupol was "a real genocide" and estimated that about 100,000 civilians were in the city.
He added that it was considered "more than 20,000 people" have been killed in the besieged port city.
12:18
Soldiers in Mariupol 'continue to hold the defence' - Ukrainian official
As we've been reporting, there is no indication from Ukraine that it will be surrendering to Russia in the besieged city of Mariupol.
An adviser to the mayor of Mariupol, Petro Andriushchenko, said on Telegram that despite Russia's "'surrender corridor' for the remaining troops" in the city, "our defenders continue to hold the defence".
Andriushchenko added that the hostilities from Russia are not limited to the Azovstal steel plant, where Ukrainian soldiers are reported to be staying.
"During the fighting, the occupiers shelled private residential houses with heavy artillery again", he said.