So Putin knocked him off, or he never got on the plane. Don't think I can settle on being certain about anything tbh.
I've seen video that very much suggests that it's anti air missle induced crash landing. Obviously take unverified sources with a pinch of salt but it's on brand for Putin.
The way it was tumbling back to earth, it wasn't what we call CFIT or controlled flight into terrain, so there was likely some kind of decompression or major structural failure due to internal or external influences. But yeah, Putin definitely did Putin. Can you imagine being one of the other 9 people though? "****.. Prigozhin's on this flight.. "
Barring a total collapse of the Putin regime, nil. There's a rail bridge between Russia and Crimea, reinforcement can be rolled in as needed. Even if there wasn't the Russians control Sevastapol, Ukraine's attacks there have been very expensive for Russia but not crippling. If there wasn't Sevastopol Crimea has 8 airports/airfields with large runways, so reinforcements can be flown in even if land and sea become cut off. Even ignoring that Ukraine can't retake it for the same reason Russia can't attack out of it, the 3km wide, very easily monitored and easily bombarded land bridge between Crimea and the mainland. But having said that, every time Ukraine blows something up in Crimea, it means Putin has to replace something and make it unavailable for the front, or not replace it and risk further strikes against his stockpiles in Crimea. So the Ukrainians will keep hitting targets in the region.