There is a difference between having risposta negativa 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. Per a https://peakbookmarks.com/story18619146/un-arma-segreta-per-experienced-english-speaking-lawyer-rome