Barack Obama has said following:

> 
> My continued expectation is that Russia or other countries that have
>  talked about potentially providing Mr Snowden asylum recognise that
>  they are a part of an international community and they should be
>  abiding by international law.
> 
> 
> 

Is there in fact any [international law](http://en.wikipedia.org/wiki/International_law) or [multilateral treaty](http://en.wikipedia.org/wiki/Treaties#Bilateral_and_multilateral_treaties), which would require countries to detain and extradite other countries' suspects? 

If not, does any of mentioned countries have any bilateral treaties with US regarding the subject?