As Hairychested wrote. Much more coverage in polish media than here. I imagine that a plane made in Russia in 1990 could be only serviced in Russia in 2010, as I don't think anyone else would have any spare parts. Second thing is that even Aeroflot stopped flying them but since I remember there was always the problem of buying new planes as every single government elected didn't want to do it as it would seem as waste of money to the taxpayers and wouldn't re-elect them.
Pilots were speaking fluent Russian and English. They were military pilots but the plane was a civil flight so although the airport was military, the airport crew can only advise the pilots, they can order them to fly somewhere else if it was a military flight.
Other thing is why did they put all the top generals, ministers and MP's, along with the president in one plane. I understand it's prestigious to fly with the president rather to go on the train or by car and people were using there influences to get on the passenger list.
There was only one landing approach and that is when they crashed, the plane circled around the airport 4 times, but that wasn't trying to land.
I know that it's easy to find some conspiracy theory, and Russians are aware of it as well and they allowed Polish investigators to work along with their on the same rights etc what previously would probably be hard to imagine. They are doing everything and co-operating as they can. I'll just wait for the official report.
Smaller plane carrying all reporters landed no problem 1.5h before, but a transporter plane was sent to a second airport before the Tupolew due to bad weather condition. President have a previous history of putting pressure on the pilot to land in dangerous conditions however this time it seems that the pilot made the decision BUT how can You not feel the pressure when You know that if You won't land there and then the President and all top generals will be late and You will be to blame. So tragedy happened. Great tragedy, someone can not like this or that party, but they were all people that died. I also read that the passengers were not aware they will crash and everything happened within around 3 seconds. Everyone died instantly so didn't feel much pain.
Wait for the detailed report before putting any conspiracy theory. Probably someone here will be saying there is a UFO in one of the satellite pictures. It's weather that changed, it's not that Russians produced fog specially for their landing. In Scotland You can get rain, sun, than rain again in less than 30 minutes.