Moscow airports have suspended flights, the BBC reports.
All four Moscow airports - Vnukovo, Domodedovo, Zhukovsky and Sheremetyevo - have introduced temporary flight restrictions, Rosaviatsia spokesman Artyom Korenyako announced.
Earlier, restrictions were also reported at the Tambov airport. There is a risk of drone attacks in the Tambov region.
About half an hour after the introduction of restrictions, Moscow airports have resumed flights.