Prigozihn March to Moscow. On the way to Moscow he kills a reported 16 Russian military members and shoots down 5 helicopter.
Suddenly just before prigozihn makes himself new president news announces he has made deal and will not topple Putin.
If you know nothing of Russian power structure, perhaps this will enlighten you. Imagine in America if somebody shoots down 5 helicopters and kills 15 American soldiers. This death most certainly ly would not go unanswered, but Putin announces complete forgiveness.
Well, FSB runs Mother Russia. Putin is not real power. FSB is. Prigozihn would not back off if he did not have some crazy assurances that were airtight. His life was on the line if he lost.
What happens is he won and FSB basically negotiate Russian surrender. Putin is now figure head. Likely they thought it weak that Russia would be toppled by military coup.
Here is what likely happened. Russia told Prigozihn that he should just chill and run for election which comes up in spring. The FSB promised they will rig election in Prigozihn's favor.
Prigozihn will be next president of Russia.