An opinion of a Russian pilot. (translated)
"The reason may be in the lay-out of the terrain. TU was on course 267-268, to the left from the axis by only 50-55m at the distance of a 1,000 m from the butt-end of the stripe. Had tangage +1...+2. Which means was rising. Where does it follow from? From the trees cut. One, the birch, was cut h=12...13m H=238m (above the sea level), the second, by the road, was cut h=5...6m at height H=249m. The distance btw them 270,, that is little enough for the crew to have time to make any sharp maneuvres. The crew simply didn't know or lost out of attention that the stripe is practically (if to move from the E) located at an elevation, and had lowered much lower than the glissade. The butt-end of the stripe H=253m. This is all on the base of GE and it lies by height not more than 1%, and this is in the worst cases.
At the distance over 1,000m from the stripe they have, possibly, sat down even lower, due to even lesser height above the sea-level of the Eastern slope. "