Why was a A-7 doing with a f-4 during a soviet escort?

I've got this book entitled "spyplane" about the various recon
aircraft used by western and eastern block countries during the cold
war and i just noticed a strange photo . in it is a ELINT an-12 cub
being flanked by a F-4 phantom from the USS saratoga . Ok the pic
looked normal at first and then i see in the left hand corner what
looks like a vought A-7 Corsair in the background as well . I can tell
its a Corsair because i can see the shape of the aircraft and the
refueling probe scab .
Does anyone know what and why a Corsair may be doing escorting a
soviet recon plane alongside a more dedicated interceptor?