Ukraine has called for more weapons and harsher sanctions after it blamed Russia for a missile attack that killed at least 52 people at a train station packed with women, children and the elderly fleeing the threat of a Russian offensive in the east.
Ukrainian President Volodymyr Zelenskyy denounced the missile strike as another Russian war crime and says Ukraine expects a tough global response.
"Like the massacres in Bucha, like many other Russian war crimes, the missile attack on Kramatorsk should be one of the charges at the tribunal that must be held," Mr Zelenskyy said in a national video address.
Warning: This story contains graphic images and details that may disturb some readers.
Here is the latest on Russia's invasion of Ukraine:
Death toll from train station missile strike rises
Ukrainian officials say at least 52 people have been killed, including five children, and over 100 wounded by a Russian rocket strike on a railway station in east Ukraine where civilians were trying to evacuate to safer parts of the country.
The state rail company said two Russian rockets struck a station in the city of Kramatorsk, which was being used to evacuate civilians from areas being bombarded by Russian forces.
About 4,000 people, most of them elderly, women and children, were at the station when it was struck, Kramatorsk Mayor Oleksander Honcharenko said.
"There are many people in a serious condition, without arms or legs," Mayor Honcharenko said.
Even with 30 to 40 surgeons working, the local hospital was struggling, he said.
Regional Governor Pavlo Kyrylenko said the station was hit by a Tochka U short-range ballistic missile containing cluster munitions, which explode in mid-air, spraying lethal bomblets over a wider area.
Reuters was unable to verify what happened in Kramatorsk.
Cluster munitions are banned under a 2008 convention. Russia has not signed it but has previously denied using such armaments in Ukraine.
The wreckage of the missile bore the words "for the children" on its side. Russia has for years accused Ukraine of killing civilians, including children, with strikes in separatist-held eastern Ukraine.
Russia's Defence Ministry denied launching a missile strike on the station, saying its army had no targets assigned in Kramatorsk on Friday.
It accused Ukraine of carrying out the attack, in a statement carried by state news agency RIA Novosti. So did the region's Moscow-backed separatists, who work closely with Russian regular troops.
Experts refuted Kremlin spokesperson Dmitry Peskov's assertion that Russian forces "do not use" that type of missile, saying Russia has used it during the war.
One analyst added that only Russia would have reason to target railway infrastructure in the Donbas.
Britain's defence minister, Ben Wallace, denounced the attack as a war crime and UN secretary-general Antonio Guterres called it "completely unacceptable."
"Any delay in providing … weapons to Ukraine, any refusals, can only mean the politicians in question want to help the Russian leadership more than us," he said, calling for an energy embargo and all Russian banks to be cut off from the global system.
Bodies recovered from mass graves in Bucha
Russian families buried relatives killed in Ukraine with gun salutes and military bands on Friday, a day after the Kremlin said for the first time it had lost significant numbers of troops.
In Bucha, Mayor Anatoliy Fedoruk has said investigators found at least three sites of mass shootings of Ukrainian civilians and were still finding bodies in yards, parks and city squares — 90 per cent of whom were shot.
Russia has falsely claimed that the scenes in Bucha were staged.
On Friday, workers pulled corpses from a mass grave near a town church under spitting rain, lining up black body bags in rows in the mud.
About 67 people were buried in the grave, according to a statement from Prosecutor-General Iryna Venediktova's office, which is investigating those deaths and other mass casualties involving civilians as possible war crimes.
The killings around Kyiv were revealed when Russian forces pulled back after failing to take the capital in the face of stiff resistance.
Russian troops have now set their sights on the Donbas, the mostly Russian-speaking, industrial region where Moscow-backed rebels have been fighting Ukrainian forces for eight years and control some areas.
EU condemns Bucha cruelty, offers speedy start for Ukraine membership
European Commission chief Ursula von der Leyen said the civilian deaths in the Ukrainian town of Bucha showed the "cruel face" of Russia's army and pledged to try to speed Ukraine's bid to become a member of the European Union.
Visiting the town on Friday, Ms von der Leyen said the commission had witnessed the "unthinkable".
"There are almost no words for it," Ms von der Leyen told reporters in Ukraine. "The cynical behaviour [by Russia] has almost no benchmark anymore."
Saying the EU could never match the sacrifice of Ukraine, Ms von der Leyen offered it a speedier start to its bid for bloc membership.
Handing President Volodymyr Zelenskyy a questionnaire that will form a starting point for a decision on membership, she said: "It will not, as usual, be a matter of years to form this opinion but I think a matter of weeks."
"Russia will descend into economic, financial and technological decay, while Ukraine is marching towards the European future, this is what I see," Ms von der Leyen said.
Ukrainian officials have almost daily pleaded with Western powers to send more arms and to further punish Russia with sanctions and exclusion of Russian banks from the global financial system.
EU foreign policy chief Josep Borrell said the possibility of an oil ban would be discussed on Monday but called oil sanctions "a big elephant in the room" for a continent heavily reliant on Russian energy.
Celebrities go online to voice support for Ukraine
A group of inter-generational stars from film, TV, sports and music — including Bruce Springsteen, Madonna, Hugh Jackman, Elton John, Billie Eilish, Jon Bon Jovi and Miley Cyrus — have signed up for a social media campaign to show support for Ukraine.
The Global Citizen-organised social media rally urges governments, institutions, corporations and individuals to help fund humanitarian efforts in Ukraine and other regions of the world.
Celebrities are being asked to use their social media accounts to publicise the effort (using the hashtag #StandUpForUkraine).
"Refugees in Ukraine and around the world need our help now," Springsteen said in a social media video posted on Friday.
Celine Dion took to Instagram to upload a video of support with a caption in English and French that said: "I'm calling in world leaders to help all those who are forced to leave their homes."
The campaign takes place a day before a pledging conference on Saturday co-hosted by European Commission president Ursula Von Der Leyen and Canadian Prime Minister Justin Trudeau.
ABC/wires