Not something I know too much about, but I do know those vintage of jets can get much closer to the bombers than a SAM and can engage targets from very long range.
The bombers are firing from positions ~500 miles from the frontlines in the east/south and ~300 miles from the north - well outside of ranges Ukraine can touch with F-16s without having full control of the air and backed up with modern AWACS, etc.
TBH with the current situation they might as just well rig up some Cessna Xs with advanced radar and the ability to spit Meteors :s (OK they don't have pylons or anything so not realistic).