Surely the round trip is no more than a holiday charter from the UK to Greece/Turkey and back.
Yes Russian turnrounds can be long, but they do seem to have quite a bit to do. Sometimes you wonder what, but it's not as if the team are laying around. Don't forget that for several months of the year you maybe need to de-ice (which the Russians are normally quite efficient about) on departure.
I understand the joint agreement with Transaero is something that is fixed in the air service agreement between the two countries, and is a hangover from BMI days. Likewise BA still has some historic relationship with Aeroflot.
If the Easy cabin crew are on commission for duty-free sales of alcohol, then stock up on everything well beforehand and you will have NO difficulty finding volunteers for the trips !