The Interstate Aviation Committee (MAK) has sent Poland a final report of the deadly plane crash that killed then Polish President Lech Kaczynski in April 2010.
The details of the investigation, which came under criticism by Polish Prime Minister Donald Tusk in December, are expected to be revealed at a press conference in Moscow later on Wednesday.
Tusk described the investigation as "unacceptable," saying that some of the conclusions it had made were "without foundation."
Polish cabinet spokesman Pawel Gras said Tusk would not cut short his holiday in the Italian Dolomites to read the report.
Poland's leading investigator, Edmund Klich, said he doubted all of Poland's comments on the report had been adopted by the Russian side, since they would have taken weeks to consider and were only handed over in mid-December.
Kaczynski and other Polish dignitaries were on their way to a memorial ceremony in honor of Polish officers killed by Soviet secret police when their plane crashed in thick fog on April 10. All 96 people on board were killed.
MOSCOW, January 12 (RIA Novosti)
