Russian and Ukrainian diplomats are set to meet as the crisis appears to escalate.
The office of Ukraine’s president has said that a delegation will meet with Russian officials as Moscow’s troops draw closer to Kyiv.
Ukrainian President Volodymyr Zelensky’s office said on the Telegram messaging app that the two sides would meet at an unspecified location on the Belarusian border and did not give a precise time for the meeting.
The announcement on Sunday came hours after Russia announced that its delegation had flown to Belarus to await talks.
Ukrainian officials initially rejected the move, saying any talks should take place somewhere other than Belarus, where Russia has placed a large contingent of troops.
Intelligence reported by the Daily Mirror has also suggested that Belarussian troops are preparing to join the attack on behalf of Russia.
The news came shortly after President Vladimir Putin ordered Russian nuclear forces to be put on high alert in response to what he called “aggressive statements” by leading Nato powers.
Speaking at a meeting with his top officials, Mr Putin directed the Russian defence minister and the chief of the military’s General Staff to put the nuclear deterrent forces in a “special regime of combat duty”.
“Western countries aren’t only taking unfriendly actions against our country in the economic sphere, but top officials from leading Nato members made aggressive statements regarding our country,” Mr Putin said in televised comments.
The US ambassador to the United Nations responded to the comments from Moscow while appearing on a Sunday news programme.
“President Putin is continuing to escalate this war in a manner that is totally unacceptable,” ambassador Linda Thomas-Greenfield said.
“And we have to continue to condemn his actions in the most strong, strongest possible way.”
The alarming step came as street fighting broke out in Ukraine’s second-largest city and Russian troops squeezed strategic ports in the country’s south, advances that appeared to mark a new phase of Russia’s invasion following a wave of attacks on airfields and fuel facilities elsewhere in the country.
The capital Kyiv was eerily quiet after huge explosions lit up the morning sky and authorities reported blasts at one of the airports.
Only an occasional car appeared on a deserted main boulevard as a strict 39-hour curfew kept people off the streets.
Terrified residents instead hunkered down in homes, underground garages and subway stations in anticipation of a full-scale Russian assault.
“The past night was tough – more shelling, more bombing of residential areas and civilian infrastructure,” Mr Zelenskyy said.
“There is not a single facility in the country that the occupiers wouldn’t consider as admissible targets.”
Following its gains to the east in the city of Kharkiv and multiple ports, Russia sent a delegation to Belarus for peace talks with Ukraine, according to the Kremlin.
Mr Zelenskyy suggested other locations, saying his country was unwilling to meet in Belarus because it served as a staging ground for the invasion.
Until Sunday, Russia’s troops had remained on the outskirts of Kharkiv, a city of 1.4 million about 20 kilometres (12.4 miles) south of the border with Russia, while other forces rolled past to press the offensive deeper into Ukraine.
Videos posted on Ukrainian media and social networks showed Russian vehicles moving across Kharkiv and Russian troops roaming the city in small groups.
One showed Ukrainian troops firing at the Russians and damaged Russian light utility vehicles abandoned nearby.
The images underscored the determined resistance Russian troops face while attempting to enter Ukraine’s bigger cities.
Ukrainians have volunteered en masse to help defend the capital Kyiv and other cities, taking guns distributed by authorities and preparing firebombs to fight Russian forces.
Ukraine’s government is also releasing prisoners with military experience who want to fight for the country, a prosecutor’s office official, Andriy Sinyuk, told the Hromadske TV channel on Sunday.
He did not specify whether the move applied to prisoners convicted of all levels of crimes.
Mr Putin has not disclosed his ultimate plans, but Western officials believe he is determined to overthrow Ukraine’s government and replace it with a regime of his own stepping up his influence in the region.
The pressure on strategic ports in the south of Ukraine appeared aimed at seizing control of the country’s coastline stretching from the border with Romania in the west to the border with Russia in the east.
A Russian Defence Ministry spokesman, Major General Igor Konashenkov, said Russian forces had blocked the cities of Kherson on the Black Sea and the port of Berdyansk on the Azov Sea.
He said the Russian forces also took control of an airbase near Kherson and the Azov Sea city of Henichesk.
Ukrainian authorities have also reported fighting near Odesa, Mykolaiv and other areas.
Cutting Ukraine’s access to its sea ports would deal a major blow to the country’s economy.
It could also allow Moscow to build a land corridor to Crimea, which Moscow annexed in 2014 and until now was connected to Russia by a 19-kilometre (12-mile) bridge, the longest bridge in Europe which opened in 2018.
Flames billowed from an oil depot near an airbase in Vasylkiv, a city 37 kilometres (23 miles) south of Kyiv where there has been intense fighting, according to the mayor.
Russian forces blew up a gas pipeline in Kharkiv, prompting the government to warn people to cover their windows with damp cloth or gauze as protection from smoke, the president’s office said.
The number of casualties so far from Europe’s largest land conflict since the Second World War remains unclear amid the fog of combat.
Ukraine’s health minister reported on Saturday that 198 people, including three children, had been killed and more than 1,000 others wounded.
It was unclear whether those figures included both military and civilian casualties. Russia has not released any casualty information.
Ukraine’s UN ambassador, Sergiy Kyslytsya, tweeted on Saturday that Ukraine appealed to the International Committee of the Red Cross (ICRC) “to facilitate repatriation of thousands of bodies of Russian soldiers”.
An accompanying chart claimed 3,500 Russian troops have been killed.
Laetitia Courtois, the ICRC’s permanent observer to the UN, told the Associated Press that the situation in Ukraine was “a limitation for our teams on the ground” and “we therefore cannot confirm numbers or other details”.
The United Nations’ refugee agency said on Sunday that about 368,000 Ukrainians have arrived in neighbouring countries since the invasion started Thursday.
The UN has estimated the conflict could produce as many as 4 million refugees, depending how long it continues.
Mr Zelenskyy denounced Russia’s offensive as “state terrorism”.
He said the attacks on Ukrainian cities should be investigated by an international war crimes tribunal and cost Russia its place as one of the five permanent members of the United Nations Security Council.
“Russia has taken the path of evil, and the world should come to depriving it of its UN Security Council seat,” he said.
As Russia pushes ahead with its offensive, the West is working to equip the outnumbered Ukrainian forces with weapons and ammunition while punishing Russia with far-reaching sanctions intended to further isolate Moscow.
The US pledged an additional 350 million dollars (£261 million) in military assistance to Ukraine, including anti-tank weapons, body armour and small arms.
Germany said it would send missiles and anti-tank weapons to the besieged country and that it would close its airspace to Russian planes.
The US, European Union and United Kingdom agreed to block “selected” Russian banks from the Swift global financial messaging system, which moves money around more than 11,000 banks and other financial institutions worldwide, part of a new round of sanctions aiming to impose a severe cost on Moscow for the invasion.
They also agreed to impose “restrictive measures” on Russia’s central bank.
Responding to a request from Ukraine’s minister of digital transformation, tech billionaire Elon Musk said on Twitter that his satellite-based internet system Starlink was now active in Ukraine and that there were “more terminals en route”.
German Chancellor Olaf Scholz, meanwhile, said on Sunday that his country is committing 100 billion euros (£84 billion) to a special fund for its armed forces, raising its defence spending above 2 per cent of gross domestic product.
Mr Scholz told a special session of the Bundestag the investment was needed “to protect our freedom and our democracy.”
Mr Putin sent troops into Ukraine after denying for weeks that he intended to do so, all the while building up a force of almost 200,000 troops along the countries’ borders.
He claims the West has failed to take seriously Russia’s security concerns about Nato, the Western military alliance that Ukraine aspires to join.
But he has also expressed scorn about Ukraine’s right to exist as an independent state.
Russia claims its assault on Ukraine is aimed only at military targets, but bridges, schools and residential neighbourhoods have been hit.
Ukraine’s ambassador to the US, Oksana Markarova, said Ukraine was gathering evidence of shelling of residential areas, nurseries and hospitals to submit to an international war crimes court in The Hague as possible crimes against humanity.
The International Criminal Court’s prosecutor has said he is monitoring the conflict closely.
British Foreign Secretary Liz Truss warned that Mr Putin could use “the most unsavoury means”, including banned chemical or biological weapons, to defeat Ukraine.
“I urge the Russians not to escalate this conflict, but we do need to be prepared for Russia to seek to use even worse weapons,” Ms Truss told Sky News.
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