Standard ILS
Like to call that a strange accident!!
ILS facts:
Touchdown Point of 3deg ILS GS is about 1000 ft beyond THD.
Height over THD is calculated at 50 ft.
Installation of ILS LLZ is about 1000 ft before THD
2000 ft of distance on a 3 deg GS convert into 100 ft. above THD height
Both RWY ends at Kazan appear to connect to lowering terrain(acc. Google Earth)
That indicates aircraft was far too low when hitting the LLZ installation.
Assumption : This accident should be considered as a barely avoided undershoot