Landing on a slippery runway with strong crosswinds could easily give results that could be confused with gear faults, namely a lack of directional control and rapidly modulating braking from the ABS kicking in and out. Measuring of braking action of contaminated runways is very unreliable and pilot reports highly subjective, hence the introduction in many companies of the US TALPA system, but I doubt Aeroflot are one of those companies. So, it could be that the pilots were lead to believe they would have better traction than they got. For all that, perhaps there was a gear fault. Time will tell.