Earlier quoted context omitted.
His choice is either stay in the embassy or extradition to the US where he will face a very severe penalties, possibly the death sentence. Technically he's not being held against his will. But the reality is he can't leave.
> possibly the death sentence. What? Is there any reasonable source claiming that's remotely possible?
Penalties have gone pretty sideways in the US when it comes to being associated with terrorism, and what qualifies as terrorism extremely broad and nebulous.