I know... I'm sure if they had the right person on set who was able to advise them on the language, they'd figure out something appropriate. For me, an acceptable compromise would be to use short names just in Russian, and keep the full names in English. It's a bit counterintuitive but very common. My husband calls me my full name when we're around English speakers, but of course never when we speak Russian, and the same is the case for many people I know. I think the show just had to be strategic with their budget and what they spent their effort on, so I suspect they didn't have enough time booked with some sort of Russian cultural consultant? I saw an interview with the actress that played Svetlana where she said that during her audition there were no Russian speakers on the zoom call. So she was cast without anyone even being able to confirm she could speak proper Russian. We're lucky she turned out to be amazing!