Ukraine's President Volodymyr Zelensky has accused the Russian military of carrying out the worst crimes since World War Two. He told the UN security council that civilians had been murdered and Russian tanks had crushed people "for pleasure".
He called for those responsible to be tried as Nazis were at Nuremberg.
Gruesome images of bodies lying in the street in towns such as Bucha have generated condemnation worldwide.
As expected, President Volodymyr Zelensky launched a ferocious, passionate attack on the Russian military for its alleged violations in Bucha and elsewhere.
He says there's no difference between this and the actions of terrorists, except that Russia is a member of the UN Security Council.
Mr Zelensky said the UN had to act, because not doing so would mean there was no point to the world body.
"Are you ready to close the UN? And the time of international law is gone? If your answer is no, then you need to act immediately," he said, adding that "accountability must be inevitable".
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