While it’s a good point, it doesn’t really explain anything here.

I don’t have the details, but isn’t there a way to apply for an asylum, say, in neighbouring Georgia, Ukraine or Finland (by walking into an embassy or even straight to a land border)? Is he being held against his will? Does he not desire to move? Is it because he’s thinking those countries would be likely to deport him at the request of the US? Is it because he doesn’t believe living in a country which regime is closer to one’s own philosophy is worth the hassle of moving there? Or he doesn’t consider those countries any better than Russia in this regard? Etc.