As attaché at Rome, Parisot advocated détente with Italy. This policy was at odds with that in favour at the Deuxième Bureau (the French intelligence agency). As a result, Parisot found his communications with the Bureau stymied. He was still attaché at Rome when Italy declared war on France on 10 June 1940. He was repatriated and then selected as one of the French delegation that formally negotiated and signed the armistice with Germany on 22 June and the armistice with Italy on 24 June.