Vadim Shishimarin, 21, had pleaded guilty last week to shooting an unarmed Ukrainian man in late February. On Monday, a panel of judges in Kyiv sentenced him to life in prison.
More than a thousand soldiers were evacuated from the Azovstal steel plant, and Russia is consolidating control of Mariupol. It is making plans to annex the southwestern parts of the country.
Biden said Thursday he was sending paperwork to Congress to ratify Finland and Sweden's application to join NATO. The ratification process is expected to pass with bipartisan support.
The widow asked the Russian soldier what he felt when he killed her husband. "Fear," he said. "I understand you probably won't be able to forgive me. But I ask for your forgiveness."
As Ukrainian troops push Russian forces away from its second-largest city, the mayor urges thousands of residents to emerge from their makeshift shelters in the city's metro stations and trains.