Kseniia Petrova has been in U.S. detention since mid-February after having her visa revoked, according to friends and independent Russian media
Archived version: https://archive.is/newest/https://www.independent.co.uk/news/world/americas/us-politics/harvard-scientist-russia-deportation-antiwar-b2723063.html
Disclaimer: The article linked is from a single source with a single perspective. Make sure to cross-check information against multiple sources to get a comprehensive view on the situation.
Good riddance to bad rubbish.
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The “tank” in that person’s username is probably short for “tankie”