Russian forces reportedly killed at least three people when they bombed a children’s hospital in the Ukrainian city of Mariupol on Wednesday, shelling a humanitarian corridor and breaking a ceasefire deal that was was meant to allow residents to flee. The actions constitute a violation of international humanitarian law and, therefore, a potential war crime, says David Miliband of the International Rescue Committee. The mayor of Mariupol says there have been over 1,200 civilian deaths since the start of the war. Russian forces have also cut off the city’s water supply and electricity. “This is a strangulation of the city,” says Miliband.

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