Russian attacks batter civilians in Ukraine as Biden brands Putin a war criminal

A Russian airstrike ripped apart a theatre where hundreds of people have been living in the besieged city of Mariupol, Ukrainian officials said, as Russian President Vladimir Putin called for a "self-purification" to rid his country of anyone who questions his invasion.

The bombardment Wednesday of the theatre, which had become a makeshift shelter as combat tore across the port city over the past three weeks and made thousands homeless, left many people buried in the burning rubble, Ukraine's foreign ministry said in a statement. There was no immediate word on how many people were killed or injured.

At least as recently as Monday, the pavement in front of and behind the once-elegant theater was marked with huge white letters spelling out "CHILDREN" in Russian, according to images released by the Maxar space technology company.

"My heart breaks from what Russia is doing to our people," Ukrainian President Volodymyr Zelenskyy said Wednesday night, hours after he delivered a speech via video to the U.S. Congress that garnered several ovations.

The Russian defence ministry denied bombing the theater or anywhere else in Mariupol on Wednesday.

Six nations have called for a U.N. Security Council meeting on Ukraine on Thursday afternoon, ahead of an expected vote Friday on a Russian resolution demanding protection for Ukrainian civilians "in vulnerable situations," yet making no mention of Moscow's responsibility for the war.

"Russia is committing war crimes and targeting civilians," Britain's U.N. Mission tweeted, announcing the call for the meeting that was joined by the U.S., France and others. "Russia's illegal war on Ukraine is a threat to us all."

Russian attacks have battered cities and villages across large parts of Ukraine, including the capital, Kyiv, where residents have been huddling in homes and shelters.

A fire broke out in a Kyiv apartment building early Thursday after it was hit by the remnants of a downed Russian rocket, killing one person and injuring at least three others, according to emergency services. Firefighters evacuated 30 people from the top floors of the 16-storey building and extinguished the blaze within an hour.

Putin went on television to excoriate Russians who don't back him, even as both sides expressed optimism over efforts to negotiate an end to the fighting.

Russians "will always be able to distinguish true patriots from scum and traitors and will simply spit them out like a gnat that accidentally flew into their mouths," he said. "I am convinced that such a natural and necessary self-purification of society will only strengthen our country."

He said the West is using a "fifth column" of traitorous Russians to create civil unrest.

"And there is only one goal, I have already spoken about it — the destruction of Russia," he said.

The speech appeared to be a warning that his authoritarian rule, which had already grown tighter since the invasion began on Feb. 24, shutting down Russian news outlets and arresting protesters, could grow even more repressive.