And another article describing the final events:
Black box reveals pilots of Polish president's jet knew they were doomed and made a 'dramatic' flight deck speech | Mail Online
An "anonymous source" said:
Having ignored warnings not to land due to severe fog, the black box shows he belatedly aborted his fatal attempt to land after realising the Russian-made jet was not properly aligned with the runway at a military airport near Smolensk.He used the engines to gain altitude but in the process the plane lurched to the right, and the wing hit the tree tops.
'At this moment the head pilot made a fatal mistake. He switched on the thrust, rocking the plane to the right. The reason for this is unknown but he aimed to go higher and to turn simultaneously. As a result, his plane clipped the tops of the trees and he lost control. If he had only switched on the engine thrust to go straight up, he would have had all chances to avoid hitting the ground.'
And another comment:
One theory yesterday was that the crew were not familiar with a key peculiarity of the Tupolev-154. As the plane came into land it levelled from its oblique descent approach to a horizontal angle to compensate for bad visibility.
'A particularity of this aircraft is that if its speed of descent is more that six metres a second, when the plane levels out, it loses altitude,' said the source. 'That means that it loses altitude much quicker than usual.'