Doesn’t need to go to 33K feet, an R-60 Air to Air missile (which can be carried by SU25) has a range of 8km or over 26,000 feet.
So then the witnesses of the SAM going up were all wrong, huh???
According to this website, the practical range of the R-60 is 4km:
http://weaponsystems.net/weapon.php?weapon=HH07%20-%20R-60
And probably less if it has to climb to reach the target.