Falling debris from a Ukrainian drone that was shot down caused an explosion and a fatal fire in a shopping centre in the city of Vladikavkaz in Russia's North Ossetia region, the local governor said on Wednesday.

Russian air defenses intercepted multiple drones, but reports indicated that the strategic Millerovo air base sustained damage.

Explosions were reported in Kharkiv, Dnipro, and other cities the morning of Dec. 25, as Russia launched a mass aerial attack across Ukraine. At least two civilians were hospitalized.

The strikes ignited fires at the Kadamovsky range, a crucial training site for Russian troops heading into Ukraine.

Russia launched 184 missiles and drones into Ukraine on the night of December 25, Christmas Day. Most of them were shot down by air defense, RBC-Ukraine reports, referring to the Air Force of the Armed Forces of Ukraine and Serhii Lysak,

Ukrainian cities have been subjected to large-scale attacks on Christmas morning by Russian ballistic and cruise missiles