Re: I treat this as an admission that the FBI violated his rights
Opening a pub during prohibition would be a clear case of entrapment. This web site, could also be considered as such.
As far as your other questions go, the foreign government could very well force the US government to hand over the persons responsible (The US government seems to love forcing other countries to extradite its citizens to the US for simple hacking charge, why couldn't another country do it right back?). At the very least, foreign victims of the FBI's actions can sue the US government for damages since the US Government passed that bill last year to allow the families of the victims of the Sept 11th attacks sue the UAE, and thus threw out Sovereign Immunity.