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. As mentioned https://networkbookmarks.com/story18533085/non-ci-sono-altre-english-speaking-lawyer-consultation-rome-un-mistero