Russian airports in the cities of Nizhnekamsk, Izhevsk and Perm temporarily halted flight arrivals and departures from 10:05 a.m. (0715 GMT) on Sunday to ensure the safety of civilian aircraft, the aviation watchdog Rosaviatsia said.
It did not specify a reason for the decision, but Russian airports have previously closed when there is a risk of Ukrainian drone strikes in the area.
The three cities are located east of Moscow.