Last week, CNN broke the story that the United States had secretly extracted a top spy from Russia in 2017. What does that mean now for American intelligence operations? Guest: Julian E. Barnes, who covers national security for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading: The Moscow informant was instrumental to the C.I.A.’s conclusion that President Vladimir V. Putin had ordered and orchestrated Russia’s election interference campaign.