A civilian disaster is growing in Ukraine as attempts to evacuate residents of besieged port city Mariupol failed for a second day, with President Volodymyr Zelensky denouncing "murder" as he warned of more shelling to come on Monday.
New shelling and attacks have sent soaring numbers of refugees fleeing, sometimes under fire, as the death toll mounts.
"It's murder, deliberate murder," Mr Zelensky raged in an address.
"We will not forgive, we will not forget, we will punish everyone who committed atrocities in this war on our land.
"There will be no quiet place on this Earth except the grave."
He said Russia had announced new shelling for Monday of defence targets in Ukrainian cities and denounced what he branded the "silence" of Western governments failing to speak out.
Russian forces stepped up their shelling of Ukrainian cities in the centre, north and south of the country late on Sunday, presidential adviser Oleksiy Arestovich said.
"The latest wave of missile strikes came as darkness fell," he said on Ukrainian television.
He said the areas that came under heavy shelling include the outskirts of Kyiv, Chernihiv in the north, Mykolaiv in the south, and Kharkiv, the country's second-largest city.
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Russian troops have launched a missile strike near the village of Tuzla in Odesa Oblast, the Kyiv Independent reports.
The attack targeted key infrastructure but no one is thought to have been killed or injured, said Serhii Bratchuk, spokesperson of the Operational Headquarters of the Odesa Regional Military Administration.
A flight carrying Russian government personnel expelled by the United States on suspicion of spying has left New York for Moscow. Their plane departed around 7.30pm local time and is due to arrive in Moscow at 2.32pm local time.
In late February the US expelled 12 Russian diplomats at the United Nations over national security concerns.
A spokesperson for the US Mission to the United Nations alleged they were "engaging in espionage activities" that threaten national security,
Ukraine will ask the United Nations' top court on Monday to issue an emergency ruling requiring Russia to stop its invasion, arguing that Moscow's justification for the attack is based on a faulty interpretation of genocide law.
Although the court's rulings are binding and countries generally follow them, it has no direct means of enforcing them.
President Vladimir Putin has said Russia's "special military action" is needed "to protect people who have been subjected to bullying and genocide" - meaning those whose first or only language is Russian - in eastern Ukraine.
Ukraine's suit argues that the claim of genocide is untrue, and in any case does not provide legal justification for invasion.
The case it has lodged at the World Court, officially known as the International Court of Justice (ICJ), centres on the interpretation of a 1948 treaty on the prevention of genocide, signed by both countries. The treaty names the ICJ as the forum for resolving disputes between signatories.
Russian forces that seized Ukraine's Zaporizhzhia nuclear power plant have now placed staff running the facility under their command and restricted communications with the outside world, the UN nuclear watchdog said on Sunday.
The International Atomic Energy Agency said it was "extremely concerned" about developments at Zaporizhzhia, Europe's largest nuclear power plant, citing information from Ukraine's nuclear regulator.
"Ukraine reports that any action of plant management – including measures related to the technical operation of the six reactor units – requires prior approval by the Russian commander," the IAEA said in a statement.
"In a second serious development, Ukraine has reported that the Russian forces at the site have switched off some mobile networks and the internet so that reliable information from the site cannot be obtained through the normal channels of communication," it added.
Ukrainian authorities said Russian forces had seized control of Zaporizhzhia on Friday after setting an adjacent training facility on fire. Russia's defence ministry blamed the attack on Ukrainian saboteurs, calling it a "monstrous provocation".
Fighting stopped about 200,000 people from evacuating the besieged Ukrainian city of Mariupol for a second day in a row, as Russian President Vladimir Putin vowed to press ahead with his invasion unless Kyiv surrendered.
Most people trapped in the port city are sleeping underground to escape more than six days of near-constant shelling by encircling Russian forces that has cut off food, water, power and heating supplies, according to the Ukrainian authorities.
In a phone call with Turkish President Tayyip Erdogan, Mr Putin told Mr Erdogan he was ready for dialogue to end the fighting but that any attempt to draw out talks would fail, according to the Kremlin.
Two of the Big Four accounting firms KPMG and PricewaterhouseCoopers (PwC) on Sunday said they will no longer have a member firm in Russia due to the country’s invasion of Ukraine.
The auditing and consultancy giant KPMG said its Russia and Belarus firm will leave the KPMG network, a move that will affect over 4,500 partners and staff in Russia and Belarus.
Separately, PwC agreed PwC Russia will leave its network. The firm has operated in Russia for more than 30 years, and has 3,700 partners and staff there, it said.
“As a result of the Russian government’s invasion of Ukraine we have decided that, under the circumstances, PwC should not have a member firm in Russia and consequently PwC Russia will leave the Network,” PwC said.
Sanctions imposed by the UK, EU and the US on Russia are forcing firms globally to consider whether they should continue working with Russian clients who are state-owned.
Russia is recruiting Syrians skilled in urban combat to fight in Ukraine as Moscow prepares to push deeper into cities, US officials told the Wall Street Journal.
Russia has been operating inside Syria since 2015, targeting what it says are Islamic State and other terrorists.
An American assessment indicates in recent days it has been recruiting fighters from there, the newspaper reported, but said it was unclear how many fighters have been identified, but some are already in Russia preparing to enter the conflict, according to one official.
According to a report by Deir Ezzor24, Russia has offered the fighters between $200 and $300 “to go to Ukraine and operate as guards” for six months at a time.
The hacking group Anonymous has reportedly hacked into the Russian streaming services and TV channels to broadcast footage of the war in Ukraine.
Social media users and local media said streaming services Wink and Ivi and live TV channels Russia 24, Channel One, Moscow 24 were hijacked with scenes from the conflict.
Russian forces stepped up their shelling of Ukrainian cities in the centre, north and south of the country late on Sunday, presidential adviser Oleksiy Arestovich said.
"The latest wave of missile strikes came as darkness fell," he said on Ukrainian television.
He said the areas that came under heavy shelling include the outskirts of Kyiv, Chernihiv in the north, Mykolaiv in the south, and Kharkiv, the country's second-largest city.
Kharkiv officials said the shelling damaged the television tower and heavy artillery was hitting residential areas.
In Chernihiv officials said all regions of the city were coming under missile attack.
Mr Arestovich described a "catastrophic" situation in the Kyiv suburbs of Bucha, Hostomel and Irpin, where efforts to evacuate residents on Sunday failed. He said the Government was doing all it could to resume evacuations.
Evacuations also failed in Mariupol in the south and Volnovakha in the east because of the shelling.
Now in its 12th day, Russia's invasion of Ukraine has seen more than 1.5 million people flee the country in what the UN has called Europe's fastest-growing refugee crisis since the Second World War.
Washington cited "very credible reports" that Russia had committed war crimes by deliberately attacking civilians.
Two of the so-called Big Four accounting firms are pulling out of Russia over its war in Ukraine.
KPMG and PricewaterhouseCoopers both said on Sunday that they would end their relationships with their Russia-based member firms. KPMG said it was also pulling out of Belarus.
KPMG International said it would be "incredibly difficult" to have its Russia and Belarus firms leave the network. KPMG has more than 4,500 employees in the two countries.
PricewaterhouseCoopers said it has 3,700 employees at its PwC Russia firm and is working on an "orderly transition" for the business.
The two other Big Four companies - Deloitte and Ernst & Young - didn't immediately return requests for comment on Sunday.
Ukrainian Foreign Minister Dmytro Kuleba said more than 20,000 people from 52 countries had already volunteered to fight in Ukraine, where they will serve in a newly created international legion. He did not say how many of the foreign volunteers have arrived in Ukraine.
"The whole world today is on Ukraine's side not only in words but in deeds," Mr Kuleba said on Ukrainian television on Sunday night.
He did not name the home countries of the volunteers, saying that some of them forbid their citizens from fighting for other countries.
Mr Kuleba also urged Ukrainians living in other countries to begin a campaign to push for Ukraine's membership in the European Union.
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