Russia launched 39 drones against the city of Kyiv in the early hours of Monday, continuing its bombardment of the country.
The drones were destroyed according to the air forces. Fighter aircraft of the Air Force and mobile fire groups were used to repel the attack.
A school building being used as an army barracks was destroyed by a Himars missile strike.
According to Russia's Tass news agency, around 15 people were injured, but unconfirmed reports say hundreds of new Russian troops died.
A lack of small unit leadership is one of the problems with relying on mobilized soldiers.
Russia has carried out regular air strikes against Ukrainian infrastructure as its military ground operation has beenbogged down in the face of Ukrainian counteroffensives helped by western-supplied Himars missiles.
Military officials say that Russia has become less frequent in its airborne attacks as Moscow runs out of cruise missiles. Iran-supplied drones are easier to shoot down than Moscow's other options.
The Ukrainian spy chief said in an interview that Russia has enough missiles left for two massive strikes on Ukraine. The number of missiles is being reduced in order to maintain the intensity.
According to the Ukrainian air forces, one western-supplied air defence system, known as NASAMs, has been central in defending the capital. The Aim-120 missiles that the NASAMs use are more expensive than the Shahed drones supplied by Iran.
Two airborne drones were launched on Russian territory by the Ukrainians.
A power supply facility in Klymov district, about 100 km from the Ukraine border, was damaged in the early hours of January 2.
It was recommended.
The Baltimore military airfield is 160 km inside Russia and was reportedly bombed by Ukrainian drones.
There have been several recent cross-border drone strikes on Russian military installations.
The attack on the airfield near Saratov in southern Russia in December was not commented on by Ukrainian officials.
Budanov said in a recent interview that he believed that the strikes were likely to move deeper and deeper inside Russia.