I believe this AN26 was equipped with an equivalent of basic GPWS - called SSOS in Russian, it does the same job but not a database based like EGPWS. Rumours are they were shooting an approach knowingly below the minima and ignoring gpws warning.

New data from CAA: crash site elevation ~ 850 ft (260m), the impact occured on hdg ~140 with landing gear and flaps retracted, speed 340 km/h ~185 kt, voice recorder is still not discovered