More than 2,100 residents of Ukraine's besieged port city of Mariupol have been killed since hostilities began, the local authorities said Sunday.

"As of today, 2,187 Mariupol residents have died from attacks by Russia," the city council posted on Telegram.

It said around 100 aerial bombs have been dropped on the city. The bombing of a maternity and

A U.S. journalist was shot dead and another wounded on Sunday in Irpin, a frontline suburb of Kyiv that has witnessed some of the fiercest fighting since Russia invaded Ukraine.

Papers found on the American reporter's body identified him as 50-year-old video documentary shooter Brent Renaud, of New York.

A New York Times identity card was among the

Russia said Sunday that negotiators were making headway at talks to resolve fighting in Ukraine, more than two weeks after President Vladimir Putin ordered his army over the borders of its pro-Western neighbor.

Leonid Slutsky, a senior member of Russia's negotiating team, told the state-run television network RT that "significant progress" was made

Ukrainian officials accused Russia at the weekend of using phosphorus chemical bombs in the eastern Donbas region, while a separate air strike on a monastery sheltering civilians wounded 30.

International law prohibits the use of white phosphorus shells in heavily populated civilian areas but allows them in open spaces to be used as cover for