You can't help noticing that a small maneuvrable Yak - landed, while of the two big heavy - one gave up the other - may be also gave up, by the way, also wanted to go off away from 100 metres - but somehow mis-managed the approach - or their automated piloting system did - something clearly happened why haven't they went off away from 100 metres
As I recall from the news reports, the YAK landed more than an hour before the TU, and the visibility at the time was reported as well over 1000 meters. The fog moved in after the YAK landed, and the visibility at the time the IL attempted to land had dropped to around 500 or 600 meters. By the time the TU attempted to land, it had dropped further to only about 200 meters. Thus it is no surprise that the YAK was able to land, and the other two aircraft probably could have landed with that same visibility.
One hour after the accident, the fog had thinned out enough that the visibility was again more than 1000 meters.