Meanwhile back at the front, the Ukrainian Armed Forces have been gradually rolling back the limited success that the Russians achieved in their summer / fall offensive. Limited Russian counter attacks have been extremely costly and ineffective. This engagement is likely in the gray zone in the East where the frontline has been destabilized by the UA counter offensive.
This video is one of these that carries a somewhat broader message than a Russian assault group was destroyed. I should also warn that there are graphic images contained in the clip.
First of all, I think we can assume this is a truck-load of Russian reinforcements / replacements trying to reach a location near the line of contact. They are moving at night (or foggy dawn) because any attempt to do so in daylight would be suicidal. Nevertheless, they are spotted by a thermal equipped reconnaissance drone and quickly attacked by an explosive carrying FPV (First-Person View) drone which destroys the cab. The troops in back bail out, and after some confusion move into a belt of trees for cover.
It is at this point that we see something new. Following the opening stages of the invasion, massed artillery fires became rather rare. They require some co-location of indirect fire assets to be able to range a common target. When this did occur, counter battery Russian and Ukrainian radars would often detect the rounds and provide the calculated firing location to their own artillery for a counterstrike. Drones further complicated trying to place artillery in useful range of the enemy front line. For the last year and a half, the UA has devoted a lot of targeting to both Russian counter battery radars and indirect fire systems.
In this clip we see UA indirect fire assets of at least three different types massed onto the target area. You can also deduce how quickly, the guns are able to adjust their fires based upon correction from the thermal equipped recon bird. Toward the end, I believe we are seeing the massing of a 122 mm battery, a 155 mm platoon (two or three guns), and mortars form the closest UA infantry unit (they are the rapid lower order explosions toward the end of the bombardment portion of the clip.)
If the clip's broader interpretation is correct, Russian infantry are now in a far worse situation than the more recent exchange rate estimates coming out of the UK and NATO would suggest. Also note that UA forces occupied the position not long after the strike.