 From 1965, he served as the redactor-in-chief of "Europe-Action", in which he wrote about neo-paganism, the Waffen SS and the Charlemagne Regiment.Mabire was one of the architects of the euro-nationalist break with the old French nationalism supported by the magazine.He supported instead a pan-European nationalism, decentralized and based on the identities of regions, seen as smaller ethnic nations, a thesis later embodied in Yann Fouéré's "Europe of 100 Flags", published in 1968.