There is a difference between having voto negativo extradition treaty and not extraditing a citizen. Having an extradition treaty means that there is an established way to hand over criminals/suspects to a country requesting extradition. The mechanism is clear and all the rules about the process are transparent. Non Extradition https://todaybookmarks.com/story18640879/non-nota-proposito-di-fatti-english-speaking-lawyer-in-barcelona