Ukraine's President Volodymyr Zelensky on Monday accused Moscow of seeking to "destroy" his country, as Russia defended its overnight strikes that obliterated a shopping mall in the capital Kyiv, killing eight people.

Ukraine could not "hand over" the eastern city of Kharkiv, Kyiv or the heavily bombarded port city of Mariupol, the president told local media, rejecting Russian demands to surrender.

Nearly a month after Russia launched its full-scale invasion on February 24, its assaults have become more deadly despite unprecedented sweeping sanctions imposed by Western allies.

Moscow has ramped up its air and sea operations as the Kremlin is "desperate" to turn the tide against a ferocious Ukrainian resistance, a senior US defence official said.

Russian strikes, likely a missile, laid waste to a shopping mall in Kyiv, whose mayor announced a new curfew from 8:00 pm (1800 GMT) on Monday until 7:00 am on Wednesday.

AFP reporters saw six bodies covered by black sheets laid out on the ground at the complex called "Retroville".

"My apartment shook with the force of the explosion, I thought the building would collapse," said Vladimir, 76, who lives nearby.

"It's the biggest bomb to have hit the city until now," said Dima Stepanienko, 30. He found himself flung to "the foot of his bed" by the explosion, he added.

An Orthodox priest walking through the wreckage muttered prayers while cursing "Russian terrorists".

Russia said it had targeted the shopping mall with "precision-guided weaponry" because it was in fact used to store rocket systems and ammunition.

But Russian President Vladimir Putin's troops have been increasingly accused of deliberately targeting civilians, including at the port city of Mariupol.

Almost 350,000 people are trapped without water and electricity in the southern city which has been bombarded by Russian troops for almost a month in what EU foreign policy chief Josep Borrell described as a "massive war crime".

Zelensky urged Europe to significantly dial up pressure on Moscow to halt its invasion, saying the continent must cease all trade with Russia.

- 'Completely destroyed' -

"No euros for the occupiers. Close all of your ports to them. Don't export them your goods. Deny energy resources. Push for Russia to leave Ukraine," Zelensky said in his latest video address.

Ukrainian leaders also stressed they were standing firm against invaders in Mariupol, which is suffering a critical humanitarian crisis.

Defenders of the port city have "played a huge role in destroying the enemy's plans and enhancing our defence," said Ukraine's Defence Minister Oleksiy Reznikov.

"Today Mariupol is saving Kyiv, Dnipro and Odessa. Everyone must understand this."

The Kremlin's military command had warned authorities in Mariupol had until "5am... on March 21" to respond to eight pages of demands, which Ukrainian officials said would amount to a capitulation.

Rejecting the ultimatum by Russia, Ukraine's Deputy Prime Minister Iryna Vereshchuk said Moscow should instead allow the trapped residents to escape.

Mariupol is a pivotal target in Putin's war in Ukraine -- providing a land bridge between Russian forces in Crimea to the southwest and Russian-controlled territory to the north and east.

A Greek diplomat, believed to be the last EU diplomat to leave the city, said the devastation would rank alongside history's most ruinous wartime assaults.

"Mariupol will be included in a list of cities in the world that were completely destroyed by the war, such as Guernica, Stalingrad, Grozny, Aleppo," said Manolis Androulakis, as he arrived back in Athens late Sunday.

- Oil prices surge -

In the north, Ukrainians were told to temporarily take shelter after an ammonia leak at a nearby chemical factory, before an all-clear was sounded mid-morning.

At the port city of Odessa, known as the pearl of the Black Sea, shelling by Russian warships damaged several houses. No casualties were reported, an official in the Ukrainian city said.

Away from the frontlines, leaders of the United States, Britain, France, Germany and Italy were once again in urgent talks on the war.

Separately, foreign ministers of the European Union were gathered in Brussels to mull fresh sanctions against Russia.

Some members within the bloc are pushing for a complete embargo on Russian oil and gas, but Germany has so far rejected the call, warning it could spark social instability.

The Kremlin on Monday heaped on the warnings against such a ban.

"Such an embargo will have a very serious impact on the world energy market, it will have a very serious negative impact on Europe's energy balance," said spokesman Dmitry Peskov.

World oil prices, already sky-high over the Ukraine conflict, on Monday surged again as top producer Saudi Arabia warned that attacks by Yemeni rebels on the kingdom's oil facilities posed a "direct threat" to global supplies.

Energy prices and supply security issues will be on the table at an EU summit on Thursday in Brussels, to be attended by President Joe Biden.

The US leader will also join in a NATO summit and G7 talks, before travelling on Friday to Poland, which has seen more than two million Ukrainians cross its border to flee the war.

Moscow furiously hit out against Biden after he branded Putin a "war criminal".

"Such statements by the American president, which are not worthy of a high-ranking statesman, have put Russian-American relations on the verge of rupture," the foreign ministry said.

- Spectre of famine -

Kyiv meanwhile turned to another major world power, China, urging it to "play an important role in" ending the conflict.

Humanitarian conditions continued to deteriorate in the mostly Russian-speaking south and east, where Russian forces have been pressing their advance, as well as in the north around Kyiv.

Aid agencies are struggling to reach people trapped in besieged cities.

Around 10 million Ukrainians have fled their homes, roughly one-third going abroad, the UN refugee agency said.

The repercussions of the war are spreading far beyond the region, with famine feared in parts of the world because Russia and Ukraine are both major agricultural exporters.

"Sudan is in a particularly vulnerable position because 86-87 percent of its wheat imports is coming from Russia and Ukraine combined," warned David Wright, chief operating officer at charity Save the Children.

Signs of strain are also appearing in Russia, where scenes of panic buying at supermarkets prompted authorities to urge the public not to stockpile.

"I want to calm our citizens: we are fully self-sufficient when it comes to sugar and buckwheat," deputy Prime Minister Viktoria Abramchenko.

"Panic-buying only destabilises the distribution network," she said.

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Ukraine calls on China to 'condemn Russian barbarism'
Kyiv (AFP) March 19, 2022
Ukraine on Saturday called on China to join the West in condemning "Russian barbarism", after the US warned Beijing of consequences if it backed Moscow's attack on the country. "China can be the global security system's important element if it makes a right decision to support the civilised countries' coalition and condemn Russian barbarism," presidential aide Mikhailo Podolyak wrote on Twitter. China has stayed out of the international outcry against Russia's actions in Ukraine, refusing to c ... read more