As I see it the state threathened a hostile take-over of his fortune

Looming charges of fraudulent bankruptcy. He was deeply in debt yet had a near monopoly of national TV.

but he can not let go or he might get prosecuted again...

He is too old to serve time even if he were condemned in a future trial. He presently has his involvement in the Mill's affair pending, but that would soon be quashed by the statute of limitations. The only other crimes he could have going are those that he is presently committing, for which he cannot be investigated so long as he is in power. Time passes, evidence disappears. An ideal setup, his self-inflicted immunity, to commit crime.

B came to power in order to avoid prosecution, right?

Also, a big also.