Arrakis, I read the report in russian. I can confirm that it is slightly biased toward russian side - like "some equipment was broken but". The part about "leading" or requirement of russan nav on board is unclear. There was request for it in FIRST letter from polish side, but in the mess which was in this THREE requests with different planes, mixed bort numbers and types, AND request for Tusk visit sent AFTER Kachinsky request BUT for EARLIER flight it's not strange that this goes out of control.
From "Smolensk forum" I remember that there was blame from Polish AF representative that polish diplomats doesn't process their request for leading nav.