A New York Times investigation found that the United States is actively infiltrating Russia\u2019s electric power grid. We look at what that means for the future of cyberwarfare. Guest: David E. Sanger, a national security correspondent for The New York Times and the author of \u201cThe Perfect Weapon: War, Sabotage, and Fear in the Cyber Age.\u201d For more information on today\u2019s episode, visit nytimes.com/thedaily. \n\nBackground reading: The cyberattacks on Russia\u2019s power grid are intended partly as a warning, and partly to be poised to act if a major conflict broke out between Washington and Moscow.In response to The Times\u2019s report, the Kremlin warned that American attacks could escalate into cyberwar.