Russia said on Tuesday that it would significantly scale back its military activity around Kyiv and Chernihiv. Ukraine delivered a proposal for accepting a neutral and nonnuclear status.
The city, an island of relative safety surrounded by fighting, has become a hub for humanitarian aid and for people fleeing the war in the Donbas and other parts of Ukraine.
President Biden's remark about Russian President Vladimir Putin came in a speech in Warsaw. A White House official later said Biden "was not discussing Putin's power in Russia, or regime change."
International groups say Russian soldiers are threatening, detaining and even torturing Ukrainian journalists in occupied areas. One news editor says troops are holding her 75-year-old father hostage.
Thousands of Russians have left their country since their government began its invasion of Ukraine. Many have settled in Georgia, a country with a complicated history with its neighbor to the north.