Polish experts working in Moscow on a probe into the plane crash that killed the Polish president and 95 others near Smolensk in April are "dissatisfied" with the documents supplied by the Russia side, Poland's TVN24 channel said on Wednesday.

"I'm leaving with the feeling of dissatisfaction. Many things [in the documents] that we wanted to know are missing," leading expert Edmund Klich said.

The experts have submitted their complaints to the Interstate Aviation Committee (MAK). Most of them concern a lack of technical details about the Severny airport in Smolensk.

MAK has not yet commented on the complaints.

The worn-out Tu-154 that crashed while carrying Lech Kaczynski and other senior Polish officials was on its way to a commemoration ceremony of the 1940 Katyn massacre of more than 20,000 Poles by Soviet forces near Smolensk.

Russia-Poland ties have warmed on the back of Moscow's gentle handling of the aftermath the tragedy, but were strained again last week after Poland refused to extradite exile Chechen separatist leader Akhmed Zakayev, who came to Warsaw for a Chechen congress.

MOSCOW, September 22 (RIA Novosti)