Jon Jones believes he's the GREATEST fighter of all time -- not Khabib Nurmagomedov -- and he's spelling it out in a new video.
"I’m talking to all you Khabib fans out there," Jones said ... "15 world titles to your guys’ 4??? And you guys are really talking about who’s the best fighter ever? You guys are joking, right?"
"15 to 4. Are you guys’ kidding me?"
What Jones is saying is he's 15 title fights for either an undisputed or interim title -- though it's worth noting his victory over Daniel Cormier at UFC 214 was overturned due to a failed drug test.