What I can't understand, and I think it wasn't really mentioned before, is - how can you make so self-contradictory SOPs? As was said many times, Russian procedures instructed to follow ATC rather tan TCAS. But other procedures said clearly - maneuvers opposite to TCAS RA are forbidden. So it doesn't really make sense - in the situation they were, you can't do both (follow ATC and not to oppose TCAS RA). I think it might have added to some confusion on their side (decision of PIC to follow ATC, copilots queries about TCAS), adding to little time they had to decide on course of action, and everything coming at the same time.