Fred Dalton Thompson as Akaar.
Ha, I could see Fred Thompson as Akaar. I've also pictured Jonathan Hyde as Akaar, primarily from his work as Ilya Gavrik on Spooks/MI-5
(that voice!). As such, I end up giving Akaar a Russian accent, which can be cool, make things more interesting.
Speaking of accents, I know I'm probably in the minority on this, but I give First Minister Asarem a reasonably strong Nigerian accent. I tend to imagine the voice of a particular Nigerian female friend I have when reading her lines. I don't know any Nigerian actresses, but since Asarem is described as having pretty dark skin, I figured she could be plausibly played by a Nigerian woman, who might therefore have an accent.
Again, make things interesting.
Was just reading the MB page on John Candlewood, and saw this:
He had an aquiline nose and dark brown hair kept in tight ringlets about his head.
And for some reason, the first thing that popped into my head was Mark Zuckerberg with slightly altered features.