Support WBURWhat Putin's shake-up of top commanders could mean for the war in UkrainePlay06:30Download AudioMary Louise KellyAshley BrownKat LonsdorfJanuary 14, 2023 ShareIn a move that experts say is a key shift for Russia, the Kremlin has named General Valery Gerasimov as the new overall commander of the war in Ukraine. (AP)