The wreckage of the Polish presidential Tupolev Tu-154 aircraft that crashed near Smolensk cannot be given to the Polish side until the completion of the investigation, Russian Investigative Committee spokesman Vladimir Markin told Interfax.

"Naturally, the wreckage of the aircraft which is material evidence in the criminal case cannot be given to the Polish side until the end of the investigation not only in line with Russian Criminal Law of Procedure but also the international law," Markin said.

"Representatives of the Polish Defense Ministry may of course have failed to know, but should have asked their colleagues, Polish prosecutors, before making public statements in order not to look like clown in eyes of the whole world," Markin said.

From the very start of the investigation into the Tu-154 crash near Smolensk Russian investigators work in close cooperation with the Polish side, he said.

"Close business-like relations have established between us for this period of time. The Polish side sent a large number of legal requests that require holding solid investigative actions and examinations," he said.