There has been many lies and fakes from both sides, and both sides operate the same gear. Many fakes were circulated at the start, including airborne footage from 2015, images from video games, and a short lived video on social media that was taken down around day 2 of the war, showing supposed russian gear destroyed, only for the video to still have ukrainian markings with rus half assed painted on the armor, and the armor being shown looked like a defensive position not offensive, like they were hit in an air strike and hastily painted to made appear to be the enemy equipment.
Part of the problem with that image is that russia and ukraine both use flankers, and even use identical blue and white camo for them, short of serial numbers the easiest identifier is whether or not it has the russian star on the tail or wings, which there is not enough of the jet left to tell.
The other thing too is the terrain, it is featureless and looks like it might be desert, without a wider view there is no way to prove the image is even in ukraine, and not an image of a jet wrecked in training, or shot down years ago over syria during that conflict.