UNITED NATIONS — One day after Ukraine’s president laid out a forceful case against Russia’s invasion at the United Nations, the United States made its own assertions in front of the U.N. Security Council about why Russia should face further censure and isolation. Minutes later, Russia came right back, calling the claims unfair and saying Ukraine is to blame.

Antony Blinken, the United States’ top diplomat, spoke to Security Council members on Thursday, detailing allegations of what he called war crimes and other atrocities committed by Russia and urging them to “send a clear message” to the country to stop its nuclear threats.

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