Update on Russia’s war in Ukraine, as Zelenskyy makes Davos appearance

Ukrainian President Volodymyr Zelenskyy was in Davos, Switzerland on Thursday to appeal for support. The country is in the midst of a bitter winter war of attrition that has seen devastating Russian strikes on its energy infrastructure. To learn more about the current trajectory of the fighting, The World's Marco Werman speaks to military analyst Michael Kofman at the Carnegie Endowment for International Peace.