Ukraine's Zelensky said he cannot cede land to Russia as he has no legal or moral right to do so. Follow Newsweek's live coverage.

Russian missile, drone and shelling attacks overnight and Sunday killed at least four people in Ukraine, after U.S. and Ukrainian officials wrapped up a third day of talks aimed at ending the war.

Kellogg said that, together, Russia and Ukraine have suffered more than 2 million casualties, including dead and wounded since the war began.