Nearly half of Ukrainians aged 18-55 are ready to fight to defend their country against Russia, a poll conducted by a Norwegian research centre suggested on Saturday.

The United Nations human rights office said on Sunday that 1,119 civilians had so far been killed and 1,790 wounded since Russia began its attack on Ukraine.

President Volodymyr Zelenskiy has urged the West to give Ukraine tanks, planes and missiles to fend off Russian forces as his government said Moscow's forces were targeting the country's fuel and food depots.

U.S. President Joe Biden said on Saturday that Russia's leader Vladimir Putin "cannot remain in power" in a fiery speech pushing the world's democracies to unite to support Ukraine, though the White House later said Biden was not calling for regime change in Moscow.

US President Joe Biden met top Ukrainian ministers in an emphatic show of support yesterday, as Russia signalled it may scale down its war aims after failing to break Kyiv’s resistance in a month of fighting and deadly attacks on civilians.

The Russian army on Friday updated its losses in Ukraine to 1,351 soldiers, while saying that it had evacuated more than 400,000 civilians and condemning Western supplies of weapons to Kyiv.

The war in Ukraine has killed 136 children in the 31 days since the start of the Russian invasion, Ukraine’s office of the prosecutor general said on Saturday in a message on the Telegram app.

Two rocket strikes hit Ukraine's western city of Lviv on Saturday, wounding five people, regional Governor Maksym Kozytskyy said, after local authorities told residents to seek shelter in the wake of powerful blasts on the city's outskirts.

Russian forces have taken control of a town where workers at the defunct Chernobyl nuclear plant live, the governor of Kyiv region said on Saturday, and fighting was reported in the streets of the besieged southern port of Mariupol.

US President Joe Biden spoke with top Ukrainian government officials in Warsaw on Saturday during his visit to Poland to show support for the NATO alliance's eastern flank in the face of the Russian invasion of Ukraine.

Ukrainian President Volodymyr Zelenskiy called on energy producing countries on Saturday to increase output so that Russia cannot use its oil and gas wealth to "blackmail" other nations.

The war in Ukraine has killed 136 children in the 31 days since the start of the Russian invasion, Ukraine's office of the prosecutor general said on Saturday in a message on the Telegram app.

US President Joe Biden will argue in a speech in Poland on Saturday that the "free world" opposes Russia's invasion of Ukraine and that there is unity among major economies on the need to stop Vladimir Putin, the White House said.

The United States will work to supply 15 billion cubic metres of liquefied natural gas (LNG) to the European Union this year to help it wean off Russian energy supplies, the transatlantic partners said yesterday.

Russian precision-guided missiles are failing up to 60 percent of the time in Ukraine, three US officials with knowledge of intelligence on the issue told Reuters, a possible explanation for the poor progress of Russia’s invasion.

Ukrainian troops are recapturing towns east of Kyiv and Russian forces who had been trying to seize the capital are falling back on overextended supply lines, Britain said on Friday, one of the strongest indications yet of a shift in momentum in the war.

Ukrainian authorities said Friday that about 300 people died when a Russian airstrike blew up a theater where hundreds of civilians were sheltering — a catastrophic loss of civilian life that, if confirmed, is likely to further crank up pressure on Western nations to step up military aid.

Russians have rushed to stock up on anti-depressants, sleeping pills and contraceptives among other products since the conflict in Ukraine began, data released on Thursday showed, with people buying a month's worth of medicine in just two weeks.

President Volodymyr Zelenskiy said on Friday that Ukrainians "need to achieve peace" and halt Russian bombardment that has forced millions to flee to countries like Poland, where US President Joe Biden is due to witness the crisis first hand.

Bangladesh is one of the 140 countries that voted for a UN General Assembly resolution demanding aid access and civilian protection in Ukraine on Thursday, and criticized Russia for creating a "dire" humanitarian situation after Moscow invaded its neighbor one month ago.