It's starting to make sense now. Putin has disowned Prigozhin so he can run amok in the Ukraine. Prigozhin will be the one to detonate the tactical nuke or blow up the power plant and Putin will say,"he is not acting on behalf of Russia!" He's just gone to Belarus to make it look like the separation is real. Within 60 or 90 days I expect something large to happen.
NATO made it clear that any fallout from a nuclear attack in Ukraine reaching a member state would trigger article 5. If Putin thinks he can pin such an attack on a rogue actor like Prig instead of Russia then maybe he can get away with it.