Jon Jones is going nuclear on Dana White and the UFC -- claiming the company is lying about his contract demands to fight Francis Ngannou ... and now Jon is calling for his release.
Here's the backstory ... Jon and Francis have been trying to set up a super fight -- but Dana White said it wasn't going to happen because Jon was asking for too much money.
"He told my lawyer he wants what Deontay Wilder was paid [for the Tyson Fury fight],” White said .