I think we have different definitions of what "badly" means when we are talking about the full might of the United States, if they wanted him badly Cathryn would've been making zero-dark-frothy by now. Also the rape charges pre-date most of the embarrassing leaks on Wikileaks, not to mention that a trial in Sweden of all countries is not the place you threaten some one with, and the US-Swedish extradition treaty makes it unlikely for that to ever happen.

And most importantly he's been held up in the Ecuadorian embassy not the Russian one, Ecuador is the 4th largest receiver of US Economic and Military aid in South America the US also provides loan guarantees for most of Ecuadors loans including the recent 10bln USD loan from China which was secured through the IIC which is a US body.