Sheppey,
Thats great information about a stick shaker going off.
According to
Antonov An-148 Passenger Transport Aircraft - Aerospace Technology
"The An-148 features a partial glass cockpit which can accommodate four crew members. The cockpit is equipped with five 6inื8in multifunction LCDs developed by Aviapribor and fly-by-wire flight controls."
The flight profile shows a cycle of climb and descent, and assuming GPS AirSpeed and GPS ground speed were displayed, at least one pilot may have freaked out at seeking zero air speed and kept lowering the nose to see what he wanted to see, "airspeed" and then rather than checking or listening to the other crew, became even more convinced of his own false narrative.
It makes you wonder how they can build a Fly By Wire aircraft and then have a "partial glass cockpit" when all the components of an AHRS system are available on E-bay.
Even if we ignore the "transcript" of the CVR, then there is still a failure to use the check list which would have mentioned the Pitot Heat and or Pitot Heat Failure, and assuming separate systems from left to right, it also has all the hallmarks of a captain seeing what he wanted to see etc.
That's not unique to the Russian Culture where fear terror and intimidation is found as normal on the dark side of Russian culture.