Ukrainian Foreign Minister Dmytro Kuleba discusses escalating tensions between his country and Russia; neurological symptoms reported by U.S. diplomats stationed in foreign countries and Homeland Security officials in the Trump admin.
Starts: James Bamford, John Bolton, Bill Burns, Robin Garfield, Ben Hodges, Dmytro Kuleba, Scott Pelley, David Relman, Timothy Snyder, Lesley Stahl