Not sure why the creators of series like this think that audiences who are expecting authenticity will get past the fact that every "Ukrainian" or "Russian" in the film is speaking British accented English. The signs are all in the Cyrillic alphabet, everyone has Russian surnames, but we are expected to ignore all that and listen to the actors all speaking English from a British Public School. This requires too much effort and is totally distracting. Why not use Russian speaking actors with subtitles. That would have been so much more palatable! This seems to be a very common method in European productions where actors from another country pretend to be natives of the country in which the series is made. So, we have German actors pretending to be Italians, surrounded by Italian signage yet speaking in German, and vice versa. Seriously?

I really tried to stretch my imagination to the limit but somehow hearing Comrade Dyalenko speaking in Public School accented English just did not cut it. So much better is the foundational aspect of the event was adapted and set in the UK....it would have been the same element of fantasy required, except the language would then have matched the geography!