On this week's "60 Minutes," Foreign Minister Dmytro Kuleba tells Lesley Stahl that Ukraine is not signaling abandonment of NATO plans. High-ranking Homeland Security officials in the Trump administration say they were overcome with feelings of vertigo, confusion and memory loss while on White House grounds and in their Washington, D.C.-area homes. The incidents and symptoms they describe are similar to the "Havana Syndrome" that has been reported by American diplomats in foreign countries since 2016. These claims were corroborated by former National Security Adviser John Bolton, who fears there is a threat to the highest levels of the U.S. government. In a two-part segment, these officials speak with Scott Pelley.