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U.S. on alert for potential cyberattack from Russia over Ukraine

Russia's growing threats stretch from Eastern Europe to power grids in the U.S. The Department of Homeland Security issued a new warning about Moscow having the capability to carry out a range of cyberattacks against important websites and critical infrastructure. CBS News cybersecurity analyst Chris Krebs, former director of the U.S. Cybersecurity and Infrastructure Security Agency, joined CBS News with more.
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