Not necessarily. Countries without formal treaties can still cooperate on a case-by-case basis or use other legal mechanisms to return individuals. While there isn’t a single global body overseeing all extraditions, organizations like Interpol can issue Red Notices, which are requests to locate and provisionally arrest an individual pending extradition. https://bookmarkforest.com/story18472570/la-guida-definitiva-a-english-speaking-lawyer-services-in-switzerland