If one is to believe the Russians (ha!) the picture shows a jet which is clearly not an Su-25 but rather a more modern Mig.
First, look at the wings. An Su-25 has a very shallow swept wing design which is because it is for ground attack. You need wings which are stable at slow speeds.
The jet in the forgery clearly has very sharp swept back wings consistent with all modern jet fighters.
In addition, if you look closely at the picture the Russians provided, there are no pods on the wingtips of the jet shown. Now look at the Su-25. Pods on each wing tip.
Also, the elevators (the small wings at the back of the jet) are too large in the picture provided. The Su-25 has much smaller, more narrow ones.
Second, look at the nose of the jet in the forgery. Long and pointy. Now go look at a picture of an Su-25. Shorter and more stubby, similar to a Harrier.
Finally, there is issue of ceiling. The Su-25 has a max ceiling of 23,000 feet. Most 777s fly from 35,000 to roughly 60,000. If the Su-25 was flying at roughly the same altitude as the jetliner, that means the pilot was flying higher than Mt. Everest without any oxygen because the Su-25 does not have a pressurized cabin.
Granted, none of this will matter to the Russian people, but anyone who has two brain cells can clearly see this isn't even close to being an Su-25 as the Russians claim.