Inside Talos' effort to protect the Ukrainian power grid

Joe Marshall, a central figure in the story of how Cisco Talos and other teams within Cisco worked together to protect the Ukrainian power grid, joins the show this week. He recaps a recent CNN story highlighting the new piece of equipment he and a group of volunteers worked on together to ensure the clocks that power the Ukrainian electric grid can withstand GPS disruption in the face of Russian cyber attacks and kinetic warfare.