That's what the 'Highly qualified specialist' visa is for. If no, there would be an issue with Russians being qualified under EASA (in that it's rare, not that it's impossible).
A quick Google states that that average €3200/month gross will be required for this. Captains that's fine, First Officers with flight pay, same situation.
That's a base that I doubt will be crewed by locals for the main, even if it is run under a local contract.