White House national security communications adviser John Kirby said Tuesday that the U.S. plans to announce a "major sanctions package" on Friday, seeking to hold Russia responsible for the death of imprisoned opposition leader Alexei Navalny. Estonia Prime Minister Kaja Kallas on Tuesday said the country, which borders Russia, successfully thwarted a "hybrid operation" by Russia's security services on its territory. Russia's Federal Security Service has reportedly detained a woman with dual Russian-U.S. citizenship on suspicion of treason, Russian media reported Tuesday. The woman, believed to be a 33 year-old resident of Los Angeles, was arrested in the Urals mountain city of Yekaterinburg. She was reportedly arrested on suspicion of treason for raising funds for Ukraine's armed forces.

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Persons: John Kirby, Alexei Navalny, Kaja Kallas Organizations: White, Russia, Internal Security Service, ISS, Federal Security Service Locations: U.S, Estonia, Russia, Los Angeles, Yekaterinburg