The authorities temporarily closed Moscow's four airports, citing safety reasons, but the restrictions were later lifted.

"To ensure the safety of civil aircraft flights, temporary restrictions have been introduced on the operation of Sheremetyevo, Domodedovo, Vnukovo, Zhukovsky and Kaluga airports," Rosaviatsiya said on Dec.

All four of Moscow’s airports have been temporarily closed without any reason given, according to Russia ’s aviation watchdog. ‘Aircraft crews, air traffic controllers and airport services are taking all necessary measures to ensure flight safety,’ the statement from Rosaviatsia said.

"At Sheremetyevo, Domodedovo, Vnukovo, and Zhukovsky airports, restrictions on the arrival and departure of aircraft have been lifted as of 16:39 Moscow time (1339 GMT)," the representative said on Telegram.

Russia's aviation watchdog said on Thursday all four Moscow airports had resumed work after the lifting of temporary restrictions that were introduced to ensure the safety of civil aircraft flights.

All four of Moscow’s airports have been temporarily closed without any reason given, according to Russia’s aviation watchdog. ‘Aircraft crews, air traffic controllers and airport services are taking all necessary measures to ensure flight safety,

Russian authorities on Thursday closed all four of Moscow's airports, plus a fifth one in a city about 100 miles southwest of the country's capital, citing unspecified safety concerns.