Headlines From Ukraine – Holly Williams reports the latest from Ukraine as Russia continues its invasion.The Grid – As tensions with Russia intensify, Bill Whitaker investigates threats to the U.S. electric grid. Extreme weather, cyber-attacks, sabotage, and physical assaults have taken down parts of the grid. The Department of Homeland Security recentlyissued two urgent warnings to utilities to brace for potential cyber-attacks from Russia if it invaded Ukraine and from home-grown extremists too, citing specific plans by white supremacists to attack U.S. substations physically. Many plots trace back to a still-unsolved physical attack near San Jose, Calif., in 2013. Wrongful Detainees – Lesley Stahl reports on Americans unjustly imprisoned abroad, held by foreign governments with whom the United States has thorny, or in some cases, no relations. Our government calls them "wrongful detainees," and there are currently more than 40 of them. Danny Fenster, a Detroit native locked away for nearly six months in Myanmar, was released this fall after efforts by former New Mexico Gov. Bill Richardson. Stahl interviews Fenster, Richardson, and the State Department official tasked with bringing Americans home. Headlines, Deadlines, Bottom Lines – Jon Wertheim reports how hedge funds and other financial firms have swallowed up newspapers, closing newsrooms and slashing staff. 60 MINUTES looks at a local news landscape where headlines and deadlines have given way to bottom lines.