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If you examine the first few seconds of the video carefully, you notice the Su-25 that initially passes low over the cameraman appears to be wearing what may be bort number (the number on the nose of the aircraft) “30”. The colors and camouflage clearly seem to confirm the aircraft as being a Ukrainian Air Force Frogfoot (that is quite different from the Russian Su-25s).

If you freeze the clip just as the first Su-25 passes overhead, it appears to be armed with two S-5, 55mm (2.2 in) unguided rocket pods on two stations under left wing. These rockets launch from the ubiquitous 57mm launch tube seen on a number of Russian attack aircraft, including helicopters. They could also be the larger S-8, 80mm (3.1 in) unguided ground attack rockets used by some Russian attack aircraft. The two outboard stations look empty on this aircraft. The inboard station appears to have either the commonly seen PTB-1500 external fuel tank often used on the Su-25, or some type of unguided air-to-ground weapon, possibly a fuel air explosive tank.

This load-out is important when we think about the very large explosion seen a couple seconds later in the video (most probably ordinance exploding on the ground).

Just to the right of the fireball you see a very small, low, dark shape, wider than it is tall and roughly cigar-shaped, travel in the frame from right to left, crossing by the fireball, gaining height, and then turning roughly two-thirds on to the camera. This takes on the distinctive forward silhouette of the Su-25 Frogfoot.

Now the camera pans back to the right. A pole comes into view along with the planform silhouette of another apparent Su-25. The aircraft appears to be at a high bank angle, turning in toward the cameraman at a distance. As the aircraft continues in knife-edge flight, it predictably begins to lose altitude quickly with its wings oriented vertically.

Suddenly the pilot appears to eject. He may be out of the survivable escape envelope of the Svezda K-36 ejection seat. This is the ejection seat made famous by celebrated Russian pilot Anatoly Kvochur at the Paris Air Show in 1989 when he ejected from a MiG-29 after a bird was ingested into one of his engines causing a low altitude, low speed, high angle of attack flameout and subsequent low altitude ejection. The pilot in the Su-25 in this video does not appear to have been as fortunate as Kvochur was in Paris in ’89. The aircraft in this video erupts into a spread of fire just after the ejection seat appears to fire, but no visible parachute is seen.

Source : https://theaviationist.com/2022/03/18/su-25-crashing-ukraine/