North Korean troops join Russian forces on the frontlines

In Ukraine, North Korean troops are arriving to reinvigorate Russian forces on the frontline, in what could mean a deadly new phase of this war.

Michael Kofman, senior fellow in the Russia and Eurasia Program at the Carnegie Endowment for International Peace, joins us to discuss what's happening on the battlefield and how President-elect Donald Trump's victory could change the trajectory of the war in Ukraine.