PARIS—France says there’s no doubt that Iran’s intelligence ministry was behind a foiled June plot to attack an exiled opposition group’s rally outside Paris, and as a result, has seized assets belonging to Tehran’s intelligence services and two Iranian nationals.
The hardening of relations between Paris and Tehran may have far-reaching consequences for Iran as President Hassan Rouhani’s government looks to European capitals to salvage a 2015 nuclear deal after the United States pulled out and reimposed tough sanctions on Iran.