kontrolor
do you know how fast the radar blip was refreshed? do you know how fast the aircraft was descending - 8m/s...modern mode c radar display (typical in civilian operational rooms) is refreshed arround every 4 seconds and the data displayed is not raw data, so there is extra delay. I have no idea what kind of equipment ATCOS had at hand and its capabilities... (havent read the MAK report yet).
so I can only speculate on your question why they didn't a) notice b) react
Link with picture of the smolensk of radar screens, use google to translate/
They where working with the RSP-6M2 landing radar, it refreshes every second. Source: MAK report page 53. And by the way, it is an older system with raw-data.
A good controller knows the limits of his equipment and adjusts the calls for that.
I suggest, you read the report first. It is not very helpful to explain facts again and again to posters, who are not up on the necessary level of information due to not reading it.
franzl