Ukrainian President Volodymyr Zelenskyy railed against the United Nations' ineffectiveness to stop Russia's ongoing war in a speech to the Security Council on Tuesday. 

Zelenskyy told the UN Security Council that he sees two options for the group following the discovery of mass civilian killings in the Kyiv suburb of Bucha: punish Russia or dissolve itself.

Zelenskyy urged the Security Council to remove Russia, which is a permanent member of the council, "as an aggressor and a source of war so it cannot block decisions about its own aggression."

Or, he said, the UN's security body can "dissolve" and reform entirely. 

"If there is no alternative and no option, then the next option would be dissolve yourself altogether," Zelenskyy said.

Zelenskyy spoke to the council days after hundreds of Ukrainian civilians were found killed in Bucha after Russian forces retreated from the Kyiv region. Many corpses were found in partially excavated mass graves while others were found lying in the streets, according to media reports.

Zelenskyy used his speech on Tuesday to call for a reform of the world's security system.

Russia, which invaded Ukraine in late February, has exercised its veto to block UN action to stop and condemn Putin's attack on Ukraine.

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