False statements 

This is a false statement:

"Russia is offering full cooperation to Polish prosecutors during the investigation.[52] Polish investigators in Russia have been given access to all procedures of Russian investigators. They do not have the authority to conduct investigative actions by themselves, but they are participating on equal terms with their Russian counterparts in the interviews with people involved and other parts of the investigation. Polish officials are to secure all Polish state documents found in the wreckage, as well as electronic devices (portable computers and mobile telephones) belonging to government officials and military officers. In turn Russian investigators received from Poland materials secured after the crash, including those about the technical state of the airplane and fitness of the pilot. "

please change it.