However I'm not sure an agreement is required and (I believe) agreements are usually only made concerning laws or punishments that are not applicable in the pre

However I'm not sure an agreement is required and (I believe) agreements are usually only made concerning laws or punishments that are not applicable in the pre-extradition country. Therefore if Sweden and the USA can agree that breaching national security secrets is a crime in the USA and Sweden recognize a similar crime (which I'm sure they do), and the USA agree not to kill Assange I don't see any reason why they couldn't extradite.