A maternity ward and a children's ward have been destroyed in a Russian air strike on a hospital in the southern city of Mariupol, officials there say
"The destruction is colossal," the city council says. There are reports of many dead and injured, with children buried under rubble
Ukrainian President Volodymyr Zelensky calls the attack on the facility a "war crime"
The UN called the attack "shocking" while the UK said it was "abhorrent"
Russia earlier agreed a new 12-hour ceasefire to allow civilians to flee six of the worst-affected areas in Ukraine, according to Ukraine's Deputy PM Iryna Vereshchuk
Civilians have been leaving the north-eastern city of Sumy and Enerhodar, the cities' mayors say
But Ukraine says continued Russian shelling has again stopped residents leaving the besieged city of Mariupol as well as Izyum near Kharkiv
Russia has for the first time acknowledged that it is using conscripts in its invasion of Ukraine
Ukraine says the former nuclear plant at Chernobyl has lost its power supply, following the site's seizure by Russian troops
Poland has welcomed one million Ukrainian refugees since Russia's invasion. Kasia and Marcin are just one of many families who have taken in those displaced by the conflict.
Oksana fled with two children, but her eldest son and husband stayed behind in Ukraine to fight.
"I will remember these people for my entire life," she tells the BBC of her Polish hosts.
Polish family take in Ukrainian mother and children
Adam Easton
Warsaw Correspondent
As we've been reporting, Poland says it is ready to deploy all its MiG-29 fighter jets to a US Air Force base in Germany, following discussions about providing Ukraine with the aircraft.
US and UK officials have said they would support any decision by Warsaw to supply the jets to Kyiv. But there were always significant logistical difficulties to overcome, including how exactly to transfer the planes to Ukraine.
The Polish government is wary of Russia’s response should it supply the aircraft directly to Ukraine, which would be seen as a direct provocation by Moscow. Earlier, Polish officials said any military decision should be taken by Nato, not by Poland alone.
In this statement, Poland is throwing the ball back into the Americans' court.
It allows Poland to supply the MiG-29s - which Ukrainian pilots are trained and ready to fly - not to Ukraine, but to the US first, so that then Washington must decide what to do with them.
Image source, Getty ImagesA Polish Air Force MiG-29 (file photo)
Barbara Plett Usher
State Department Correspondent, BBC News
Image source, Getty ImagesA top state department official, Victoria Nuland, has said that Poland's decision to put its Russian-made fighter jets at US disposal rather than hand them directly to Ukraine was a "surprise move".
"To my knowledge, it wasn't pre-consulted with us," she told the Senate Foreign Relations Committee, following reports that Warsaw was ready to deploy its MiG-29s to a US Air Force base in Germany.
Secretary of State Antony Blinken said on Sunday the Biden administration had given the "greenlight" to Poland's plan to send the fighter jets.
But the idea was for the US to "backfill" Warsaw's needs with American warplanes to fill the gap, not itself transfer the Polish planes to Ukraine.
Nuland, the Under Secretary of State for Political Affairs, has a long history of dealing with Russia.
When asked what would convince Vladimir Putin to end the Ukraine conflict she said it would take a threat to his leadership, and that outcome would most probably be in Russian hands.
Image source, Getty ImagesUkraine's First Lady Olena Zelenska
The first lady of Ukraine has published an open letter condemning "the mass murder of Ukrainian civilians".
Olena Zelenska writes that it was "impossible to believe" the Russian invasion would happen and it has created "a horrific reality" for millions, especially children.
But she also hails the defiance of Ukraine's people: "The aggressor, Putin, thought that he would unleash blitzkrieg on Ukraine. But he underestimated our country, our people, and their patriotism."
"While Kremlin propagandists bragged that Ukrainians would welcome them with flowers as saviours, they have been shunned with Molotov cocktails," she writes.
Expressing her gratitude for international support and relief efforts, Zelenska calls on the global media and the rest of the world to "keep showing what is happening here and keep showing the truth".
"If we don't stop Putin, who threatens to start a nuclear war, there will be no safe place in the world for any of us."
It will now be a "criminal offence" for any Russian aircraft to enter UK airspace, says UK Transport Secretary Grant Shapps.
"We will suffocate Putin's cronies' ability to continue living as normal while thousands of innocent people die," Shapps tweeted.
In a letter to "all UK airports and airfields", Shapps instructs air traffic controllers "not to provide access to any aircraft which they have reason to believe is a Russian aircraft".
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Michelle Fleury
BBC World News Correspondent in Philadelphia PA
The impact on Russia of President Biden’s ban is likely to be minimal. The US imports a small share of Russia's oil exports and doesn’t buy any of its natural gas.
However, the cost to America won’t be insignificant, pushing up petrol prices and stoking domestic inflation. In the US, petrol prices have already jumped 11% in the past week.
This is forcing the US to revisit its alliances, potentially paving the way for sanctions on Venezuelan oil to be lifted.
In the last few days, US officials met with the government of President Nicolas Maduro to see if Venezuelan oil might replace Russia's.
A revived Iran nuclear deal could bring Iranian oil back to the market. But so far an agreement remains elusive.
There is also a report that the White House is considering a trip to Saudi Arabia to repair relations and convince the kingdom to pump more oil.
And then there is the question of America's own considerable oil and gas production capabilities. Given prices are at their highest level in 14 years, US producers say they are ramping up production but warn that increasing supplies won’t happen overnight.
Image source, Getty ImagesSeveral luxury brands are suspending their Russian operations.
Automakers Ferrari and Lamborghini said they will not produce vehicles for the Russian market until further notice.
In a statement, Ferrari said it plans to donate €1m (£832,000) to support relief efforts for Ukrainian citizens.
Lamborghini said it "hopes for a swift end of the hostilities and a return to diplomacy”. It plans to make a donation to the United Nations High Commissioner for Refugees.
The biggest Swiss watch brand, Rolex, also said on Tuesday it is halting exports to Russia.
They are among a host of high-end retailers - including Chanel, Louis Vuitton and Gucci - to pull back from the country in recent days.
Earlier the Ukrainian president addressed in the UK House of Commons about the invasion by Russia.
Starting and ending with a standing ovation from British MPs, President Zelensky spoke about the war so far on a day-by-day basis, and said Ukraine would continue to fight and would not give up.
Watch his statement in full below.
In full: Ukrainian President Zelensky's message to UK
Image source, ReutersPepsiCo has become the latest food and drinks giant to scale back business in Russia.
The firm says it is suspending sales of Pepsi-Cola in the country, as well as its global drink brands including 7up and Mirinda. But it will keep selling daily essentials, such as baby milk formula.
PepsiCo's announcement comes minutes after its rival, the Coca-Cola Company, said it was suspending its business in the country.
Image source, UK ParliamentIf you're just joining our live coverage, or want a recap, here's a summary of some of the key developments over the past 24 hours:
Image source, Getty ImagesThe Coca-Cola Company says it is suspending its operations in Russia.
It is the latest in a string of well-known Western brands to halt their work in the country - after similar announcements today from McDonald's and Starbucks.
"Our hearts are with the people who are enduring unconscionable effects from these tragic events in Ukraine," a statement from Coca-Cola says.
The fizzy drinks company had been facing growing pressure to pull out of Russia, with #BoycottCocaCola trending on Twitter in recent days.
Image source, Getty ImagesUS network ABC News has released an interview it had with Ukraine's Zelensky.
Zelensky's responses to the questions were also posted on the Ukrainian president's website.
Here's a summary of what he said:
Image source, Getty ImagesRussia is a major global supplier of metals such as nickel and palladium
Russian President Vladimir Putin has signed a decree that bans the export of certain commodities and raw materials.
The decree's stated goals are "ensuring the security of the Russian Federation and the uninterrupted functioning of industry".
The Russian cabinet must now decide on the list of commodities and countries subject to the ban over the next 48 hours.
The ban will be in effect until the end of 2022.
It comes only hours after the US announced it would ban imports of Russian oil and gas, and the UK said it would phase out its dependency on Russian oil.
The new measures are likely to upend commodity markets. Apart from its massive fuel exports, Russia is also a major global supplier of grains and metals, including 40% of the world's palladium.
Starbucks has said it will pause all business activity in Russia, including shipments and cafe operations.
This follows McDonald's decision to also temporarily close all restaurants and pause operations in Russia.
Image source, Getty ImagesUkrainian President Volodymyr Zelensky has thanked US President Joe Biden for his decision to suspend Russian oil and gas imports.
He called on other world leaders to follow suit, saying the move would strike at "the heart of Putin's war machine".
Earlier on Tuesday, Zelensky also delivered a historic virtual address to the UK House of Commons, in which he called for even more Western sanctions to be piled on Russia.
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Sarah Rainsford
BBC Eastern Europe Correspondent
We just saw a convoy of buses carrying almost 600 Indian students arrive at Poltava station from the northeastern city Sumy - the first successful evacuation via a safe corridor in this conflict.
They are now crammed onto a slow train west; some had to stand all the way down here in the buses, many will now travel for hours more sitting on their cases or squeezed into corridors.
The scenes were chaotic as anxious students ran to the train worried they wouldn't make it on board - and to safety in Lviv.
We spoke to several who described terrifying days living in basements and shelters under Russian shelling with limited food and water.
The local authorities here say they've managed to evacuate some 5,000 people in total today, including many Ukrainian women and children - who travelled separately from the students and are expected in Poltava in the coming hours.
Tim Franks
BBC Newshour, Lviv
This jewel of a city is trying to wrap itself in wadding.
Walk around the handsome centre of Lviv and you see statuary shrouded in plastic; a church’s windows covered in aluminium sheeting. Behind closed doors, museums have packed away their treasures.
Andriy Pochevka is in charge of preserving and restoring Lviv’s cultural heritage. He cuts a doleful figure outside the Cathedral Basilica of the Assumption, as two men on a cherry picker screw foam-filled plywood over the stained-glass windows.
Pochevka says they had a plan ready to go, but "the last time we did this, it was World War Two. Before that, World War One."
He understands there is no protection from a direct hit – from an air strike, artillery, or even gun fire. But it is something.
"It's clear from their behaviour in the east, the enemy has no respect for art or for heritage. So for us, being prepared, means being armoured."
Image source, ReutersBritish consumer goods giant Unilever is suspending all imports and exports of its products to Russia, as well as media and ad spending.
"We will not invest any further capital into the country nor will we profit from our presence in Russia," said CEO Alan Jope in a statement on Tuesday.
But Unilever will "continue to supply our everyday essential food and hygiene products made in Russia to people in the country", he said. The company owns several household brands, including Axe, Ben & Jerry's and Dove.
The world's biggest cosmetics company L'Oreal also suspended new Russian investments on Tuesday and temporarily closed its stores.
"We strongly condemn the Russian invasion and the war in Ukraine, which is causing so much suffering to the Ukrainian people," the French firm said.
Both companies have paused their Ukrainian operations to focus on the safety of employees and their families, and have each pledged €5m (£4.2m) worth to relief efforts in the country.
Image source, Getty ImagesPoland says it is ready to deploy, "immediately and free of charge", all its MIG-29 jets to the Ramstein Air Base in Germany and place them "at the disposal" of the US government.
In exchange, Poland asks the United States to provide them with "used aircraft with corresponding operational capabilities", and it adds that it is "ready to immediately establish the conditions of purchase of the planes".
The Polish government also requests other Nato allies - who are owners of MIG-29 jets - to act in the same vein.
The US confirmed over the weekend that it is working on a deal with Poland to supply Ukraine with jets.
It is reported to involve Poland handing over its existing MIG-29 in exchange for the US providing it with other fighter jets as replacements.
Image source, Getty ImagesAs we reported a short while ago, the US is suspending its imports of Russian oil and gas. Here's what that means:
“America is united in its resolve to stand up to Putin and there’s broad support across the country for degrading the strength of Putin’s economy and war machine through energy exports," a senior Biden administration official said on Tuesday.
The official said the US had consulted closely with European allies "but we do not expect them and did not ask them to join us".
He added the US - unlike much of Europe - was able to take immediate actions because of its significant domestic production capabilities and relatively small quantity of Russian imports.