[CJE]

It may be a confusion with another French WWI ace, général Armand Pinsard, who was in charge to recruit volunteers for the LVF - Ligue des Volontaires Français - to fight alongside the Germans in Russia (but on foot not in the air).
Fonck, like many of his likes, certainly played a double-cross rôle at the time but he was cleared after the war. I had never heard he wanted to raise a kind of "Legion Condor" à la française.