Definitely call the Moscow office, explain your question to the receptionist, and ask to speak to a recruiter.
Everyone seems to believe that consultants are expected to know everything. Not true. You just have to be able to figure it out in the most efficient way possible. In this case, that's probably a phone call.
That being said, I'd bet on English.
Best, Allen
I would bet 99% English but you can touch base with HR for this
Good luck!
Hi,
It will be in English. Also, some of your interviews will be in English, so pls keep in mind. Feel free to reach out if you need help with prep
Best