I don't have a clear picture yet.
The video, compact shredded debris field (as seen thus far) and airport diagram are suggestive of Tatarstan 363. TOGA thrust on go-around without compensating control input, leading to pitch-up, stall and crash on the airport.
However, Av Herald discounts the video, so I'll mark that as (???) for the moment.
Another alternative is hard landing and disintegration along the runway - which should mean daylight will bring a picture of a debris field the length of the runway.
Or as some have suggested, something in between - a hard bounce or other ground contact that rendered the aircraft unflyable and brought it back to earth at the far runway end.
I expect things will become clearer very soon.