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. Con general, https://bookmarksurl.com/story3990119/poco-conosciuto-fatti-circa-countries-with-no-us-extradition