Kasia Madera, BBC News, Lublin, Poland

It was the morning of 11 March in the eastern Ukrainian region of Dnipropetrovsk Oblast, when a bomb crashed into Olena Selichzianowa's home - and her family.

Speaking in Russian, the mother of five-year-old twin boys, Nazar and Timur, describes how she fell to her knees, pulling her sons beneath her to protect them from the pieces of shrapnel. After the bomb's impact she recalls nothing.

All three were blinded by the flying fragments that cut into their arms and faces. Their skin was badly burned, a small shard of glass embedded itself in one of Olena's eyes and her leg was broken.

The family were pulled from the wreckage and taken to a nearby hospital, but their wounds were so serious they had to be moved quickly.

In Lviv, eye specialist Dr Nataliya Preys was made aware of this family's injuries. Dr Preys sent images of the wounds to her former teacher in Poland, Professor Robert Rejdak, at the Medical University of Lublin.

He knew the three needed to be treated immediately. But the fighting in Ukraine meant it would take a week for Olena, Nazar and Timur to reach Poland.

"They have come from hell," Professor Rejdak told us. "The mum was completely blind, she could only reach out to touch her children. The children were so hungry and tired when they first arrived that they only ate, slept and cried."

He is visibly moved as he recounts their first meeting. Then, his expertise as a leading surgeon at one of Europe's largest eye hospitals takes over.

"We decided to operate on mum. I performed bilateral cataract surgery. The surgery was really complicated because of the wounds, because of a piece of glass inside one eye.

"Fortunately the surgery went really perfectly and Olena sees almost fully two days after. The healing process is perfect so I hope it will be even better - but at least now she can see her boys and look around."

The little boys' journey to health will take longer. Nazar has lost his eye.

Image source, Reuters

If you're just joining us - or in need of a quick catch-up - here are the latest developments in Ukraine so far today.

Bucha 'massacre'

• As Russian forces retreat, and as Ukraine claims to have retaken the whole region around the capital Kyiv, the horror of what is left behind is emerging
• A scene of devastation greeted Ukrainian troops after they recaptured the commuter town of Bucha, the BBC's Jeremy Bowen reports
• "At least 20 dead men were lying in the street as Ukrainian troops entered the town. Some of them had their hands tied behind their backs," our correspondent says
• The UK has pledged support for international criminal investigations into any alleged war crimes

Odesa hit

• Thick black smoke has covered the skies over the strategic port city of Odesa, after Russian air strikes
• Russia claims it targeted oil facilities in the region that Ukraine was using to supply its troops
• A Ukrainian official said missiles had hit "critical infrastructure" and there were no casualties

Ukrainian gains, Russia's new focus

• Ukrainian President Volodymyr Zelensky has said his forces were boosting their defence capabilities in the east and south
• That comes after Russia appeared to have switched its military focus there and away from Kyiv

Image source, EPA

"Indiscriminate attacks" by Russian forces against Ukrainian civilians should be investigated as war crimes, UK Foreign Secretary Liz Truss says.

Referencing what she describes as "appalling acts" by Russia in towns such as Irpin and Bucha, Truss pledged the UK's full support for investigations by the International Criminal Court.

"We will not allow Russia to cover up their involvement in these atrocities through cynical disinformation and will ensure that the reality of Russia's actions are brought to light," she said.

Meanwhile, the UK's ambassador to Ukraine, Melinda Simmons, has said that, while the full extent of rape in the conflict is not known, "it’s already clear it was part of arsenal".

"Women raped in front of their kids, girls in front of their families, as a deliberate act of subjugation. Rape is a war crime," she added.

The Ukrainian Foreign Minister Dmytro Kuleba has asked the world to respond to the "massacre" that he says has occurred in the town of Bucha, near Kyiv.

"Russians aim to eliminate as many Ukrainians as they can," he said in a Twitter post, calling on the G7 group of the world's richest nations to impose sanctions on Russia in response.

Separately, the President of the EU Council Charles Michel has also used the word "massacre" to describe the scenes revealed in Bucha after Russian forces retreated from the town.

Michel says the EU will be imposing sanctions in response and is assisting in efforts to gather evidence for use in international courts.

Some more from the BBC's interview just now with Sergey Nikiforov, adviser to Ukrainian President Volodymyr Zelensky.

Nikiforov repeated Ukraine's claim that Russian troops have left the Kyiv region, and said Moscow is pulling back its forces to Belarus and preparing for a renewed offensive on eastern Ukraine.

"They're pulling from the north. They're concentrating their efforts to strike the east, to encircle our military in the Donbas," he said.

In an earlier video address President Zelensky announced that Ukraine was boosting its defences in the country's east and south in preparation for anticipated Russian attempts to seize both.

Image source, .

The UK's Transport Secretary Grant Shapps has described some of the reports emerging from territories around Kyiv given up by Russian forces as "horrendous".

"It defies belief that in Europe in the 21st Century that these sort of acts could be committed," Shapps said in a BBC interview.

"I think it's important that even in these war-torn times that this is documented as far as possible because it's important we have the ability as a global community to follow up on this afterwards."

In the town of Bucha near Kyiv a journalist from AFP news agency has identified more than 20 corpses, many of which were strewn on the street and dressed in civilian clothes.

Earlier this week the BBC's Jeremy Bowen counted 13 bodies on another short stretch of road also near Kyiv, two of which were confirmed to belong to civilians killed by Russian forces.

Russian forces could be leaving behind evidence of war crimes as they retreat from territories around Kyiv, an adviser to Ukrainian president Volodmyr Zelensky has said in an interview with the BBC.

Sergey Nikiforov described the images coming out of the towns of Bucha, Hostomel, and Irpin - near Kyiv - as "heartbreaking".

He says Ukrainian forces have found mass graves, people with their hands and legs tied up, and the bodies of civilians executed with bullets in the back of their heads.

"It's very hard to understand why this is happening," he said. "It's pure brutality. There's no military necessity to do all this."

The BBC's Jeremy Bowen has been on the ground in Bucha, the streets of which he reports are littered with corpses and burned-out tanks.

Image source, Reuters

Image source, EPA

The UK government wants to supply Ukraine with anti-ship missiles to sink Russian warships, and ease the pressure on coastal cites they are bombarding from the sea, the Sunday Times is reporting., external

The newspaper described the plan as part of a "gear change" in the West's response to the war.

It said UK Prime Minister Boris Johnson told ministers that he wanted to supply the weapons to prevent Russian forces from advancing on the southern port city of Odesa.

Russian missile strikes hit the city this morning.

An oil refinery in a different location in Ukraine - in Kremenchuk city in the centre of the country - has been completely destroyed in a Russian attack, the governor of the Poltava region has said on television, Reuters news agency reports.

"The fire at the refinery has been extinguished but the facility has been completely destroyed and can no longer function," Lunin Dmytro Lunin was quoted as saying.

The Kyiv Independent newspaper tweeted, external that a missile attack on 1 April destroyed the oil refinery - the biggest in Ukraine.

Kremenchuk is a key industrial site in central Ukraine.

Video shows thick smoke covering the skies over the strategic southern port city of Odesa, after Russian air strikes.

As we've been reporting, Russia says it targeted oil facilities in the area.

Image source, AFP

Photographs are now emerging from Odesa showing the impact of the multiple Russian air strikes that hit the port city earlier this morning.

Russia says it targeted oil facilities in the region that Ukraine was using to supply its troops.

Ukrainian officials say there are no known casualties so far.

Image source, AFP

Image source, AFP

Image source, AFP

Another update on the missile strikes that hit the Ukrainian city of Odesa this morning.

The Russian defence ministry is now saying that its forces destroyed an oil refinery and three fuel storages with high-precision sea and air missiles in the Odesa region, Interfax news agency reports.

It said that the facilities were being used by Ukraine to supply its troops near the city of Mykolaiv.

As we reported in our earlier post, Ukrainian officials say that there are no known casualties from the early morning strike.

Image source, Getty Images

All eyes have turned to the southen port city, where explosions were heard on Sunday morning.

Odesa has been preparing for an imminent attack for weeks now, with Russian warships circling off the Black Sea coast.

Residents left, and cafes and trams emptied as streets were covered in tank traps and famous monuments surrounded by protective sandbags.

But the city had since begun to cautiously reopen, despite the air raid sirens, neighbourhood patrols and fears of a Russian attack, the BBC's Andrew Harding reported last week.

The confidence was believed to partly be the result of Russia's stalled advance along the Black Sea coast.

But how prepared is Odesa, given Ukraine's President Zelensky's warning that Russian forces would now focus on capturing the east and south?

Some analysts believe it will be hard for Russia to take Odesa by sea without first establishng a base on land.

But meanwhile, the city's vast catacombs - some 2,500km of underground tunnels - are being repurpsoed as air raid shelters.

Image source, AFP

Some more information now on the missile strikes targeting the city of Odesa that we've been reporting on this morning.

In a post on his Telegram channel, Ukrainian military official Vladislav Nazarov says that so far there are no known casualties following the attack.

Nazarov adds that critical infrastructure facilities were damaged but didn't give any more details on the target.

Image source, Maxim Guchek/BelTA

Some more now on the peace talks between Moscow and Kyiv.

Yesterday, Ukraine's chief negotiator said negotiations had advanced far enough to make a meeting between presidents Volodoymyr Zelensky and Vladimir Putin a possibility (see our post at 02:28).

Russia's chief negotiator Vladimir Medinsky is now suggesting that this is not the case.

"The draft agreement is not ready for submission to a meeting at the top," Medinsky has posted on his Telegram channel.

In the Ukrainian army's daily operational update, its military officials have given details of Russian attacks in the eastern Donbas region.

"On the territory of Donetsk and Luhansk oblasts, the defenders of Ukraine repulsed six enemy attacks, destroyed four tanks, six units of armoured vehicles and seven units of enemy vehicles," military officials said in a Facebook post.

Some more now on the multiple loud explosions heard in Odesa early this morning that we've been reporting on.

Anton Herashchenko, an adviser to Ukraine's interior minister, has confirmed on his Telegram channel that "Odesa was attacked from the air" by missiles, some of which he says were "were shot down by air defence".

An AFP news wire reporter heard explosions in the port city at 06:00 local time (03:00 GMT), followed by at least three thick columns of smoke and flames visible in an apparently industrial area.

The target of the strike has not yet been confirmed.

Image source, .

The UK's Ministry of Defence has published its morning update on the conflict.

According to its military intelligence, the UK has observed a concentration of Russian air activity on Ukraine's south-east - which it suggests is part of a strategic refocusing by Moscow on the region.

While Russian forces may still be capable of an amphibious landing on Ukrainian territory, the UK believes this would be an increasingly risky operation given the time Ukrainian forces have now had to prepare.

Paul Kirby
BBC News Online Europe editor

Image source, Getty Images

Russia has shifted most of the focus of its war to eastern Ukraine - specifically the two big regions of Luhansk and Donetsk, which run from outside Mariupol in the south all the way to the northern border.

This push into the area known as Donbas could signal a more prolonged conflict, says the US.

"The key is that it has been identified by the Kremlin as a Russian-speaking part of Ukraine that is more Russia than Ukraine," says Sam Cranny-Evans of the Royal United Services Institute.

These areas may be broadly Russian-speaking, but they are no longer pro-Russian. "Mariupol was one of the most pro-Russian cities in Ukraine and to level it is beyond my comprehension," says defence specialist Konrad Muzyka, head of Rochan Consulting.

Russian forces have already triggered a humanitarian catastrophe in the east, reducing Mariupol to ruins, but they have failed to inflict defeat on Ukraine's military.

Russia's next aim will be to push south to encircle Slovyansk, a city of 125,000 people that already experienced war at close hand when it was seized by Russian-backed forces in 2014 before being recaptured.

Image source, Getty Images

"What is the goal of the Russian troops? They want to capture Donbas and the south of Ukraine," President Volodymyr Zelensky said in his nightly address on Saturday.

He said that Ukrainian forces too were shifting their attention eastward: "We are aware that the enemy has reserves to increase pressure in the east."

On Sunday morning, explosions were reported in the strategic southern port city of Odesa on the Black Sea coast. We're still awaiting confirmation of what happened.