Generally that's the case. However, Sweden was trying to extradite him under a European Arrest Warrant which has no such requirement for the offence to be a cri

Generally that's the case. However, Sweden was trying to extradite him under a European Arrest Warrant which has no such requirement for the offence to be a crime in the country being extradited from and has much weaker safeguards in general. (This has caused some problems over the years.)