Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

In an address to the United Nations Security Council on Tuesday, Ukrainian President Volodymyr Zelenskyy laid out the atrocities he said were committed by Russian forces in Bucha, including women shot in front of their homes and raped in front of their children.

"There is not a single crime they would not commit," Zelenskyy told the council via a live video feed from Kyiv.

Zelenskyy proposed a summit to reform the world’s global security apparatus, listing a number of major conflicts since World War II he said the U.N. Security Council had failed to prevent.

He said Russia's actions in Bucha, a town northwest of the Ukrainian capital, are no different from other acts of terrorism.

"Here it is done by a member of the United Nations Security Council destroying internal unity borders, countries," Zelenskyy said.

He accused Russia of "pursuing a policy to kill ethnic and linguistic diversity."

Zelenskyy went on to criticize the council for failing to provide security to Ukraine, saying, the U.N. "simply cannot work effectively."

"If this continues, countries will have to rely on their selves, not (the) international community," Zelenskyy said. "The U.N. will be ready to close. Do they think the time of the U.N. is gone? If no, then the U.N. must act immediately."

Zelenskyy added, "accountability must be inevitable."

Telling the council he was speaking on behalf of the deceased, Zelenskyy detailed in graphic detail the horrors found in Bucha, describing them as "the most terrible crimes we have seen since the end of World War II.“

"The Russian military searched for and purposefully killed anyone who served our country. They killed –-- shot and killed women outside their houses when they just tried to call someone who is alive. They killed entire families, adults and children, and they tried to burn the bodies," Zelenskyy said. "I am addressing you on behalf of the people who honor the memory of the deceased, every single day in the memory of the civilians who died, who were shot and killed in the back of their head after being tortured, some of them were shot on the streets. Others were thrown into the wells, so they died. They are in suffering."

Noting Russia's veto power on the council, Zelensky proposed the council remove Russia's power so it "cannot block decisions against its own aggression" or else "dissolve yourselves altogether."

Zelenskyy's address was met with applause by the members of the council.

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Zelenskyy addresses UN Security Council

Ukrainian President Volodymyr Zelenskyy spoke to members of the UN Security Council amid international outrage of alleged atrocities in Bucha, Ukraine.

Video has emerged purportedly showing a Russian shell striking an ambulance parked outside a children's hospital in the Ukrainian city of Mykolaiv.

Security camera footage released by Mykolaiv Gov. Vitaly Kim shows the moment the empty ambulance is hit and explodes next to the hospital on Monday.

As of March 30, there had been 82 attacks on health care in Ukraine since Russian forces invaded, resulting in at least 72 deaths and 43 injuries, including patients and health workers, according to the World Health Organization.

-ABC News' Fergal Gallagher

European Commission President Ursula von der Leyen issued a proposal Tuesday for new sanctions targeting Russia's economy.

The proposal will require the approval of the European Union's member states.

In a statement, von der Leyen accused Moscow of "waging a cruel and ruthless war in Ukraine and said its alleged atrocities "cannot and will not be left unanswered."

Among the new sanctions being proposed are banning imports of coal from Russia, banning Russian ships and Russian-operated ships from accessing European Union ports and banning imports of other Russian products including seafood, liquor, and wood. The proposal also calls for a full transaction ban on four key Russian banks - among them the country’s second-largest, VTB.

U.S. Secretary of State Antony Blinken said Tuesday that the death and destruction in Bucha, Ukraine, reportedly at the hands of Russian forces shows a "deliberate campaign to kill, to torture, to rape, to commit atrocities."

Blinken spoke to reporters at Joint Base Andrews before boarding a plane to Brussels for the Western military alliance's annual spring meeting of foreign ministers.

He said the reports of atrocities emerging in Bucha, a suburb of the capital of Kyiv were "more than credible" and added it "reinforces our determination and the determination of countries around the world to make sure that one way or another, one day or another, there is accountability for those who committed these acts, for those who ordered them."

Ukrainian forces in recent days retook Bucha from the Russians and found the bodies of more than 400 civilians lying dead in the streets or in mass graves, some with their hands bound and shot at close range.

Blinken didn't directly address a question of whether the United States has evidence linking the atrocities on the ground in Busha to Russian officials back in Moscow. Instead, he said the United States is working to support efforts to document evidence by Ukraine's prosecutor-general, the U.N. Human Rights Council's commission of inquiry, and others.

Blinken noted that before the war began, U.S. officials warned that atrocities "would be part of the Russian campaign."

"Horrifically, tragically, what we're seeing in Bucha and in other places supports that," Blinken said.

He said the United States will work with its NATO and G-7 allies to support Ukraine and increase pressure on Russia, especially with meetings among both groups later this week in Brussels.

-ABC News' Conor Finnegan