Sochi International Airport named after V. I. Sevastyanov reminds of the requirements of federal legislation for identity documents:
"Recently, there have been more and more cases at airports where, during the check-in procedure for a flight or during passport control, laminated birth certificates are presented, which is a violation of current legislation. In such a case, passengers may be denied boarding the aircraft if the document cannot be freed from lamination. And this is already a spoiled mood or a failed vacation."
Detailed information on the airport website is available at link.