Ukraine's president Volodymr Zelenskyy has told the UN Security Council the actions of Russian troops are no different from other terrorists such as Islamic State.
Zelenskyy began by outlining the catalogue of horrors he says have been committed by Russian troops, which he says are the "most terrible war crimes since World War II".
His address comes as the world reacts in horror to images of mass graves and bodies strewn across streets around the capital of Kyiv.
Zelenskyy earlier toured one of those towns - Bucha - where Russian troops have now retreated from.
Bucha's mayor says displaced residents should not return to their homes yet as there are still mines in the area.
Zelenskyy says what's seen in Bucha is only the tip of the iceberg of the war crimes Russia's military may have committed.
He's demanded Russia be removed from the security council so it cannot block decisions about its own aggression.
Linda Thomas-Greenfield, the US ambassador to the UN, agreed Russia should not have a position of authority in the security council.
And if the council can't find a way to help stop Russia's actions, Zelenskyy says it should "dissolve", because it proves "there is nothing it can do besides conversation".
The UN secretary-general, António Guterres, says the war in Ukraine is "one of the greatest challenges ever" to the international order.
Away from the conference, the EU has proposed fresh sanctions against Russia, including a ban on Russian coal and on Russian ships entering EU ports.
It says a ban on oil imports is in the works.
Israel has joined the chorus of countries to accuse Russia of war crimes in Ukraine.
Meanwhile heavy fighting continues in eastern Ukraine, where Russia is now focusing its battles.
University of Canterbury professor of political communications and Ukrainian citizen Natalia Chaban spoke to Susie Ferguson.
