Three flights are delayed at Russia's Kazan airport, and eight more have been rescheduled due to imposed restrictions, according to the online flight board on the airport's website, Report informs via Russian media.
Flights to Istanbul and two flights to Moscow have been delayed for departure.
"The airport is temporarily not accepting or dispatching flights," said Artem Korenyako, a representative of the Federal Air Transport Agency.
Earlier, restrictions were introduced at this airport to ensure flight safety.
Similar restrictions were imposed at Sochi airport. Preliminarily, this is related to UAV attacks.