Alice,
>>They changed fuelling location when already in air, because of weather conditions in Mozdok? Who'd "expect" them, in Sochi?
Oh, interesting. One tidbit of information that if it is correct is interesting to know.
With this kind of thing, speculation will arise almost immediately, that is natural and also well known. On the other hand, we have to realize that expeccially in this day and age, a proper investigation does take time. The first few hours after an accident are always full of misinformation, speculation and other wild guesses, it usually takes a few days before we even start to get an idea what went wrong.
"Don't know" in this situation doesn't sell any papers but it is exactly where we stand at this time. We, and for all proper purposes, and the investigators who start their job now, simply don't know anything else that this airplane crashed for reasons yet to be determined.
Also the original denial of suspicious activity could well be an act of human denial, "it can't happen to us" kind of thing. Understandable and human, I would not put too much importance into that either. We all once thought stuff like this is not possible and had to learn otherwise.