Russia shelled the Ukrainian city of Kharkiv as it pressed on with its invasion Tuesday, defying mounting global pressure that saw a war crimes probe opened against Moscow, sanctions smash its economy and FIFA ban it from the World Cup.
After their first talks since the war started failed to secure a breakthrough Monday, Russia continued to target residential areas and Ukrainian President Volodymyr Zelensky called for a global ban on Russian planes and ships.
"We must close entry for this state in all ports, all canals and all the world's airports," he said on Facebook.
Russian President Vladimir Putin had earlier outlined Moscow's demands for ending the invasion, including recognition of Russian sovereignty over Crimea and Ukraine's demilitarisation.
He issued his demands in a phone call with French leader Emmanuel Macron shortly before the Russian-Ukranian talks.
Instead, the world has responded with an intensifying diplomatic, economic, cultural and sporting backlash, with Moscow coming under fire at the UN General Assembly and the International Criminal Court (ICC) opening a war crimes investigation.
"I am satisfied that there is a reasonable basis to believe that both alleged war crimes and crimes against humanity have been committed in Ukraine" since 2014, ICC prosecutor Karim Khan said in a statement.
Russia also faced urgent calls at an extraordinary UN General Assembly debate to end its "unprovoked" and "unjustified" assault, which has provoked a massive diplomatic, economic, cultural and sporting backlash.
Inside the General Assembly hall Monday, UN Secretary-General Antonio Guterres pleaded: "The fighting in Ukraine must stop. Enough is enough."
It followed Putin's phone call with Macron where the Russian leader "stressed that a settlement is possible only if Russia's legitimate security interests are unconditionally taken into account," said the Kremlin.
Fighting continued during the dialogue, with at least 11 people killed by Russian attacks in Kharkiv and Russian missile fire on several residential buildings.
Explosions were also reported in and around Brovary, a city on the outskirts of the capital, Kyiv.
Russian fire killed several civilians, including children, in Kharkiv and Russian armoured vehicles and tanks are "everywhere" around the city, said mayor Igor Terekhov, quoted by Ukrainian media.
More than 350 civilians, including 14 children, have been killed during the invasion, Ukraine says, while more than half a million people have fled the country.
In Kyiv, many were preparing for a fresh assault with makeshift barricades dotting the streets.
The Russian army urged Ukrainians to leave Kyiv "freely" on one highway out ahead of what is an expected Russian offensive to capture the capital.
The International Atomic Energy Agency said it was "gravely concerned" as Russian forces advanced towards Ukraine's largest nuclear plant, strongly warning against any military action that could threaten the Zaporizhzhia facility.
Western nations have moved to increasingly isolate Russia, with the US expelling 12 members of Moscow's UN mission from America for being "intelligence operatives".
Canada announced a ban on Russian oil imports Monday.
The European Union and its allies were also preparing more sanctions against Russia in the coming days to "raise the cost" of war in Ukraine, an aide to Macron told reporters.
And Turkey said it would implement an international treaty to limit ships passing through the Dardanelles and Bosphorus straits, a move requested by Ukraine to block the transit of Russian warships.
The Russian ruble crashed to a record low as sanctions imposed by the West over the weekend had an immediate impact in Moscow, forcing the central bank to more than double its key interest rate to 20%.
Putin also announced emergency measures intended to prop up the ruble, including banning residents from transferring money abroad.
Long queues for groceries snaked through the streets of Kyiv on Monday after a strict 36-hour military curfew was lifted and volunteer militias learned how to make home-made explosives.
"We will greet them with Molotov cocktails and bullets to the head," bank employee Viktor Rudnichenko told AFP. "The only flowers they might get from us will be for their grave."
Many Russians raced to withdraw cash.
Retired soldier Edward Sysoyev, 51, fidgeted impatiently while in line at a bank in Moscow.
"90% of Russians are going to rush to withdraw their rubles and change them into dollars, property or even gold... it'll be ordinary people who pay for this military bun-fight," he said.
'Unprovoked armed aggression'
In Russia, there were more signs of rare dissent among the usually ultra- loyal oligarchs who surround the Russian leader -- in addition to anti-war demonstrations that saw an estimated 2,100 people arrested on Sunday.
Russian tycoon Oleg Deripaska said "we need real crisis managers and not fantasists", while billionaire banker Oleg Tinkov said "innocent people are dying every day, this is unthinkable and unacceptable!"
Western defence officials and the Kyiv government say Ukrainian troops have so far kept the country's major cities out of Russian hands despite incursions in the capital and Kharkiv over the weekend.
However the small southern city of Berdyansk has been occupied, Ukraine said.
Moscow claimed it had "gained air superiority over the entire territory of Ukraine," while accusing Ukrainian troops of using civilians as human shields.
However Olivier Kempf, a security analyst at the Foundation for Strategic Research think tank, said that Russian forces were "not bogged down."
"This is war, so there are difficulties. They may have logistics issues. But regardless of what we're told, they are making progress," he told AFP.
"Only in video games do you conquer a country in two days."