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I'm in Moscow and, despite free healthcare system and the first-search-result commercial clinic being heavily booked up vaccination-wise, lots of the non-first-search-result clinics, by results of my quick roll call, actually have free slots available... the next business day. Call your Russian friends to get them vaccinated or something.
https://www.mos.ru/city/projects/covid-19/privivka/ also contains places where you can get vaccinated, including some shopping malls where you can get vaccinated without booking in advance.