On this week's "60 Minutes," as tensions with Russia intensify, Bill Whitaker investigates threats to the U.S. electric grid. Lesley Stahl reports on Americans unjustly imprisoned abroad by foreign governments with whom the U.S. has thorny relations. Jon Wertheim reports on a new threat faced by local newsrooms. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.