Global outrage at accusations of Russian war crimes in Ukraine mounted after the discovery of mass graves and "executed" civilians near Kyiv.
Britain, France, Germany, the United States, NATO and the United Nations all voiced horror at the reports of civilians being murdered in Bucha, northwest of the Ukrainian capital.
Ukraine's Foreign Minister Dmytro Kuleba called it a "deliberate massacre" while President Volodymyr Zelensky on Sunday said Russian forces were committing "genocide".
Russia's defence ministry, in contrast, said "not a single local resident" in Bucha suffered violence, accusing Ukraine of bombarding its southern suburbs and falsifying images of corpses in "another production" for Western media.
Here are the Highlights on Russia-Ukraine War:
There should be no place for Russia on the United Nations Human Rights Council, Ukraine's Foreign Minister Dmytro Kuleba said on Tuesday.
"Spoke with UN Secretary General @AntonioGuterres on the current security situation and the Bucha massacre," Kuleba said on his Twitter account.
Ukraine President Volodymyr Zelenskiy said he will address the United Nations Security Council on Tuesday, after saying it is in Kyiv's interest to have the most open investigation into the killing of civilians in Ukraine.
Speaking on Monday, he said that in Bucha, where mass graves and bodies were found after Ukraine took the town back from Russian forces, at least 300 civilians have been killed, and he expects that in Borodyanka and other towns the number of casualties may be even higher.
More sanctions on Moscow, more weapons for Ukraine, and a probe into alleged war crimes by Russian soldiers: the United States is upping pressure on multiple fronts against President Vladimir Putin, officials said Monday.
As Russia pulls away from the Ukrainian capital Kyiv, leaving behind what Ukraine and its allies authorities say is evidence of mass atrocities, the war is shifting to a focus on eastern regions where Moscow already controls territory and is looking to expand.
US President Joe Biden called Monday for a "war crimes trial" over alleged atrocities in Bucha and vowed tougher sanctions against Moscow, as Ukraine's president urged the world to acknowledge a "genocide" by Russian troops near Kyiv.
Western leaders have united in outrage after dozens of bodies were found on the streets and in mass graves when Russian troops retreated from the devastated town near the capital, laying bare the horrors of a 40-day war that has killed thousands.
Ukrainian authorities have found the bodies of five civilians with their hands tied in a village west of Kiev, including those of the mayor, her husband and son.
Police showed AFP journalists four bodies, including that of the mayor, half buried in a grave in a pine forest bordering her house in Motyzhyn.
A fifth body was found in a little well in the garden.
U.S. President Joe Biden will consult allies to ensure Russia and President Vladimir Putin pay the price for war crimes being committed in Ukraine, national security adviser Jake Sullivan said on Monday.
The US Defense Department approved Monday the sale of eight F-16 combat aircraft to Bulgaria for $1.67 billion, bolstering its air force as the regional threat has risen after Russia's invasion of Ukraine.
"The proposed sale will improve Bulgaria's capability to meet current and future threats by enabling the Bulgarian Air Force to deploy modern fighter aircraft routinely in the Black Sea region," the Defense Security Cooperation Agency said.
Ten civilians were killed and 46 wounded in the Russian bombardment of the Ukrainian town of Mykolaiv, mayor Oleksandr Senkevich said in a video statement Monday.
A strike by the Russian army at 0400 GMT left "one dead and five wounded, including two seriously," he said.
That was followed by another in which "nine people were killed and 41 others wounded," he said, adding the number of casualties could still rise.
Eight people were killed and 34 wounded in Russian attacks on two towns in southern Ukraine on Sunday, prosecutors in Kyiv said, as the West warns Moscow of more sanctions over civilian killings.
"The Russian armed forces attacked the cities of Ochakiv and Mykolaiv. Shelling damaged residents' homes, vehicles and civilian infrastructure," the Ukrainian prosecutor general said in a statement on Monday.
"As a result of enemy shelling, seven residents of Ochakiv were killed and another 20 were injured. In the city of Mykolaiv one person died and 14 people were wounded, among them a child," it added.
The EU said Monday it is urgently discussing a new round of sanctions on Russia as it condemned "atrocities" reported in Ukrainian towns that have been occupied by Moscow's troops. Read more here.
Russia's chief investigator on Monday ordered an official examination of what he called a Ukrainian "provocation" after Kyiv accused the Russian military of massacring civilians in the town of Bucha.
Alexander Bastrykin, head of the Russian Investigative Committee, ordered that a probe be opened on the basis that Ukraine had spread "deliberately false information" about Russian armed forces in Bucha, the committee said in a statement.
Spanish Prime Minister Pedro Sanchez said Monday he saw signs of a possible "genocide" in Ukraine after claims that Russian forces committed atrocities against Ukrainian civilians in Bucha, a town outside Kyiv.
"We will do everything to ensure that those who have perpetrated these war crimes do not go unpunished, and therefore appear before the courts...to deal with these alleged cases of (crimes against) humanity, war crimes and why not say it too, genocide," he said in Madrid.
Polish Prime Minister Mateusz Morawiecki on Monday called for an international investigation into what he termed a "genocide" carried out by Russian troops in Ukraine.
"We are proposing an international commission to investigate this crime of genocide," he said, referring to the apparent killing of civilians in towns including Bucha near the capital Kyiv.
Germany is the main roadblock to imposing tougher sanctions on Russia, Poland's Prime Minister Mateusz Morawiecki said on Monday during a news conference, adding that Hungary was not blocking them.
His comment comes after Prime Minister Viktor Orban won a national election on Sunday after facing criticism over an insufficiently tough stance on Russian aggression in Ukraine.
"We have to see that, regardless of how we approach Hungary, this is the fourth such win and we have to respect democratic elections ... it's Germany that is the main roadblock on sanctions. Hungary is for the sanctions," Morawiecki said.
Ukraine's agriculture minister said on Monday he expects "quite a large harvest" this year and hopes Ukraine will be able to export grain, but warned that continuation of the war would mean higher prices for all countries.
The minister, Mykola Solskyi, said the situation was "difficult" with fuel, which is needed for spring fields.
Russia's foreign ministry said that footage of dead civilians in the Ukrainian town of Bucha had been "ordered" by the United States as part of a plot to blame Russia.
"Who are the masters of provocation? Of course the United States and NATO," ministry spokeswoman Maria Zakharova said in an interview on state television late on Sunday.
Zakharova said the immediate Western outcry over the images of dead civilians indicated the story had been part of a plan to sully Russia's reputation.
"In this case, it seems to me that the fact that these statements (about Russia) were made in the first minutes after these materials appeared leaves no doubt as to who 'ordered' this story."
Japan was shocked by Russia's alleged killing of civilians in Ukraine and sternly condemns such conduct, its top government spokesman said on Monday.
"Japan takes deaths of innocent civilians in Ukraine extremely seriously. We are really shocked," Chief Cabinet Secretary Hirokazu Matsuno told a regular news conference.
Germany on Sunday said the West would agree to impose more sanctions on Russia after Ukraine accused Russian forces of war crimes near Kyiv. Russia denied its forces were responsible for the deaths of civilians in the town of Bucha.
Moscow has called for a special UN Security Council meeting Monday to address claims that Russian forces committed atrocities against Ukrainian civilians in Bucha, a town outside Kyiv.
"In the light of heinous provocation of Ukrainian radicals in #Bucha Russia requested a meeting of UN #SecurityCouncil on Monday April 4," Dmitry Polyanskiy, Russia's deputy ambassador to the United Nations, said Sunday on Twitter.
Ukraine and Western leaders have erupted in outrage over the discovery of mass graves and hundreds of dead people in Bucha, a small town northwest of Kyiv. Ukrainian President Volodymyr Zelensky directly blamed Moscow for the "killings" of civilians.
Russia denied the accusations and said Kyiv staged footage of the corpses.
Ukrainian President Volodymyr Zelenskiy on Sunday appeared in a video aired at the Grammy Awards in the United States and appealed to viewers to support Ukrainians "in any way you can." Read more here.
Ukraine has recovered 410 civilian bodies from areas it recently retook from the Russian army in the wider Kyiv region, its prosecutor general Iryna Venediktova said Sunday. Read more here.