Russian Officials said a Ukrainian drone smashed into a building in central Moscow on Friday after Russian air defences shot it down, disrupting air traffic at all the civilian airports of the Russian capital.

Giving an update about that incident, Moscow Mayor Sergei Sobyanin revealed that there were no casualties after air defences destroyed a drone that fell on a non-residential building of Moscow's Expo Center complex in the early hours of Friday.

"At about 4 am Moscow time, the Kyiv regime launched another terrorist attack using an unmanned aerial vehicle on objects located in Moscow and the Moscow region," the Russian defence ministry said.

Meanwhile, Air-traffic was briefly suspended at four major airports around the capital - Vnukovo, Domodedovo, Sheremetyevo and Zhukovsky, as they reopened late Friday morning.

Similarly, Russia's air transport agency said seven flights were redirected to alternative airports.

Access24 reports that the Expo Center is a large spread of exhibition pavilions and multi-purpose halls, fewer than 5 kilometers (3.1 miles) away from the Kremlin.

Drone air strikes deep inside Russia have increased since a drone was destroyed over the Kremlin in early May, as civilian areas of the capital were hit later in May and a Moscow business district was targeted twice in three days earlier this month.