He co-organised and chaired the international colloquium "Dialoguer Entre Ennemis" in May 2021, to which participated 2018 Nobel Prize Denis Mukwege, Sinn Féinn's former president Gerry Adams, former Knesset President Avraham Burg among others. The aim of this colloquium was to build exchanges between former enemies about the peaceful resolution of conflicts. The five geographical areas tackled were Democratic Republic of Congo, Northern Ireland, Colombia, Israel and the Basque Country.