Sweden has an extradition treaty with the US. Also, the Swedes are unlike Germans, in that they are more eager to be seen to be doing the right thing and helpin

Sweden has an extradition treaty with the US. Also, the Swedes are unlike Germans, in that they are more eager to be seen to be doing the right thing and helping other countries than upholding principles. So it's quite likely they would have eagerly extradited him if the US asked politely.