In our news wrap Saturday, Russia and Ukraine exchanged hundreds of prisoners hours after a large-scale Russian attack on Kyiv, dozens of staff members have been removed from Trump’s National Security Council, the U.S. measles outbreak passed 1,000 confirmed cases, tennis star Novak Djokovic won his 100th career singles title, and a wildlife center is going to great lengths to help a bear cub. PBS News is supported by - https://www.pbs.org/newshour/about/funders