The PACE investigation report mentions Mariani as one of the MPs who were not sensitive to human rights violations in Azerbaijan and were backing the Azerbaijani authorities in the PACE. Mariani figures prominently as a friend of the Aliyev regime in the French documentary series by France 2, called Cash Investigation: Mon président est en voyage d’affaires. Mariani has personal relations with the Aliyev family; he has repeatedly spoken alongside Mehriban Aliyeva, Azerbaijan's First Lady, at several Azerbaijani-organised events in France. Mariani is the Chairman of the NGO L'Eurasie, les nouveaux horizons, a member-organisation of the European Academy for Election Observation, an election observation NGO founded by Azerbaijan apologists Stef Goris and Alain Destexhe, which has promoted Azerbaijani interests in Europe. In 2010, the NGO  L'Eurasie, les nouveaux horizons co-organised an event with an NGO led by Elkhan Suleymanov, an Azerbaijani MP at the centre of lobbying scandals in the PACE. He was also one of the key persons of the Azerbaijani Laundromat.
