The Russian Air Defence, however, shot down two drones in the Mozhaisk and Khimki districts.

"Air defences downed a drone in the Mozhaisky District of the Moscow Region, while another unmanned aerial vehicle hit a building under construction in the City," Sergey Sobyanin said. 

The Mayor said no casualty was reported in the incident.

Russian officials described it as "another attempt by the Kyiv regime to carry out a terrorist attack", reports BBC.

The building, which was hit by the drone, suffered minor damage.

An emergency official told TASS, "Several window openings were knocked out."

An aviation official told the Russian news agency earlier that Moscow’s airports had been temporarily closed to flights.