Ukraine evacuates Russian-besieged port city Mariupol

Moscow has seized two key cities in its 10-day-long invasion, Berdiansk and Kherson on Ukraine's southern Black Sea coast

The Ukrainian port city of Mariupol was to evacuate residents Saturday after Russian forces declared a temporary ceasefire to open a corridor for civilians to flee one of the war's fiercest battles.

Russia has besieged the strategic city, which proudly resisted Moscow-backed rebels during a 2014 conflict only to find itself again a target, cutting off electricity, food, water and heating in the dead of winter.

The evacuation will be seen as a prelude to a final assault that, if successful, would see the Russian army push north from occupied Crimea and link up with their forces from the east and take control of Ukraine's coast on the Sea of Azov.

After the Russian defence ministry declared a ceasefire to allow "humanitarian corridors" out of Mariupol and neighbouring Volnovakha, officials announced on social media that the city's 450,000-strong population could begin to leave by bus and private cars.

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Zelenskyy remains defiant, and announced on Saturday that Ukrainian forces are counter-attacking around Kharkiv, the country's second largest city, which has seen incursions by Russian forces and fierce bombardments.

"Ukrainian armed forces bravely hold all the key areas of our defence," he declared. "We inflict such losses on the invaders that they have not seen even in their worst dream."

Since President Vladimir Putin's army invaded on February 24, Russia has pummelled Ukrainian cities, with officals reporting hundreds of civilians killed. Europe's largest atomic power plant has even come under attack sparking fears of a catastrophic nuclear accident.

But Moscow has so far only seized two key cities in its 10-day-long invasion, Berdiansk and Kherson on Ukraine's southern Black Sea coast.

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Capturing Mariupol represents a bigger prize for Russian forces as it would deal a severe blow to Ukraine's maritime access and connect with troops coming from annexed Crimea and the Donbas.

Kremlin spokesperson Dmitry Peskov said late Friday that Moscow was waiting for a third round of talks with Ukraine in Belarus, and one of Kyiv's negotiators said it hoped to hold them this weekend.

"The third leg could take place tomorrow or the day after, we are in constant contact," Ukrainian presidential advisor Mykhailo Podolyak said Friday.

In a hospital in the Ukrainian capital, wounded soldiers told AFP of their grim battle against the Russian advance, and vowed to return to the frontline.

"We were on reconnaissance and came across an enemy column that had made a breakthrough," said Motyka, 29, who was hit by shrapnel on his right side.

"We fought them and killed their soldiers on foot, but they showered us with mortar fire."

Zelenskyy was to appeal to Washington for more assistance Saturday with an address to the US Senate after some lawmakers urged President Joe Biden to take tougher measures, including banning Russia's oil imports.

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Zelenskyy had earlier criticised NATO for ruling out imposing a no-fly zone, saying the Western military alliance had essentially given "the green light for further bombing of Ukrainian cities and villages".

With fears growing of direct conflict between Western forces and Russia -- both nuclear armed -- the US and Moscow have set up a new direct phone line to reduce the risks of "miscalculation", the Pentagon said Friday.

Russian forces attacked and seized the Zaporizhzhia nuclear plant on Friday, pushing Kyiv to accuse Moscow of "nuclear terror".

Ukrainian monitors say there has been no spike in radiation after a fire in a training facility.

Moscow denied it had shelled the plant.

In an apparent response to the unrest, Russian authorities have imposed a news blackout and several media outlets have halted operations.

Multiple media websites, including the BBC, were partially inaccessible in Russia. Twitter was restricted and Facebook blocked.

The BBC and Bloomberg said they were suspending work in Russia after lawmakers in Moscow approved legislation to impose fines and jail terms of up to 15 years for anyone publishing "fake news" about the army.

"This legislation appears to criminalise the process of independent journalism," BBC Director-General Tim Davie said in a statement.

CNN said it would halt broadcasting in Russia, while independent Russian newspaper Novaya Gazeta said it would remove Ukraine content.

The Kremlin on Saturday defended the new law, saying it was "necessary as the country was facing "an unprecedented information war".

Putin has been unmoved as Russia has become isolated in the economic, sporting and cultural fields.

But UN prosecutors at The Hague are investigating a possible war crime in the eastern city of Kharkiv, where authorities say residential areas were indiscriminately shelled.

In Geneva, the UN Human Rights Council voted to create a top-level investigation into violations committed in Ukraine.

The UN says more than 1.2 million refugees have flooded into neighbouring countries.

The global body's food agency has warned the conflict will create a food crisis in Ukraine and worsen global food insecurity, with Moscow and Kyiv providing around 29 percent of the global wheat trade.

"The bullets and bombs in Ukraine could take the global hunger crisis to levels beyond anything we've seen before," said agency director David Beasley.

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