If this is backed up at all by anything like a russian source

The Guardian is reporting this:

The cause of the crash was not immediately clear, but Prigozhin’s longstanding feud with the military and the armed uprising he led in June would give ample motive to the Russian state for revenge. Media channels linked to Wagner quickly suggested that a Russian air defence missile had shot down the plane.

https://www.theguardian.com/world/live/2023/aug/23/russia-ukraine-war-live-updates-drones-downed-moscow#top-of-blog