A passenger on board a Russian domestic flight has attempted to hijack the plane, local media reports say.
Russia's Interfax news agency reported that the passenger demanded that the plane divert to Vienna, Austria, instead of landing in Moscow.
The passenger was described as drunk, reports said.
Air traffic control had been notified that crew quickly regained control of the SkyExpress flight, from the Black Sea resort of Sochi, police said.
An official at Moscow's Vnukovo airport told Interfax that the person had been "rendered harmless" and that security personnel were ready to meet him from the plane.
The flight landed in Moscow a little later than scheduled and investigations into the incident were continuing, said Russian media.