Ukraine ruled out a ceasefire or any territorial concessions to Russia, and Poland's president said any loss of Ukrainian territory would be a "huge blow" to the entire West as he warned against appeasing Russian President Vladimir Putin

Turkey Foreign Minister Mevlut Cavusoglu has stressed the necessity of helping the Russian and Ukrainian sides in finding a face-saving way out of the crisis while continuing to put pressure on the side initiating the aggression, noting that the infringement on Ukrainian sovereignty is unacceptable.

Ukrainian President Volodymyr Zelenskiy warned that that the world is risking food shortage as a result of the war Russia waged on his country, stressing that no one is safe from the food supply disruptions.

Russian President Vladimir Putin discussed Moscow's conflict with Ukraine and its international repercussions with his security council on Friday, the Kremlin said on its website.

Russian-backed separatists in eastern Ukraine said Monday that a strike by Kyiv's forces on the rebel de facto capital Donetsk left at least 16 people dead, ahead of talks to resolve the war.

US President Joe Biden announced a ban on Russian oil and other energy imports on Tuesday in retaliation for the invasion of Ukraine, underscoring strong bipartisan support for a move that he acknowledged would drive up US energy prices.

Ukraine has succeeded in dominating social media in the first days since the Russian invasion, in an intensifying information war with Moscow that Kyiv so far appears to be winning, analysts say.

Russian President Vladimir Putin said Saturday that any country that sought to impose a no-fly zone over Ukraine would be considered by Moscow to have entered the conflict.

President Vladimir Putin urged Russia's neighbours on Friday not to escalate tensions, eight days after Moscow sent its forces into Ukraine.

A huge blaze at the site of Europe's biggest nuclear power station was extinguished on Friday, and officials said the plant in southeastern Ukraine was operating normally after it was seized by Russian forces in fighting that caused global alarm.

Russia warned Kyiv residents to flee their homes Tuesday and rained rockets on the city of Kharkiv as Russian commanders intensified their bombardment of Ukrainian urban areas in a shift of tactics after their six-day assault stalled.

At least 64 civilians have been killed and more than 160,000 are on the move after Russian troops entered Ukraine this week, a United Nations relief agency said.