His treatment is unacceptable, the sentence is outrageous (and counterproductive), but fundamentally this is why you don't get into business with and especially don't defraud petty dictators in unstable regions of the world. If this had been in his place of birth, he would have been murdered rather than imprisoned, and I imagine he should be well aware of this given his upbringing and career history.
"he would have been murdered rather than imprisoned" is also not especially comforting considering just how badly one can be scarred by imprisonment, interrogation, etc.