Mr. Treves has acted before the International Court of Justice (ICJ) as Counsel for Finland in the Great Belt case, for Peru in the maritime dispute with Chile and for the United Arab Emirates in a pending case against Qatar. He has acted as counsel for France in the arbitration with Canada on the delimitation of maritime zones in the area of Saint-Pierre-et-Miquelon, and for the Russian Federation in two law of the sea arbitrations against Ukraine.
He has sat as arbitrator in the tribunal in the Bangledesh v. India case, as president of the arbitration tribunal in a case between Timor Leste and Australia and as arbitrator in the pending law of the sea case between Malta, Sao Tomé and Principe.
Mr. Treves has experience as a consultant to various governments and international organizations and as chairman of an arbitration tribunal at the Cairo Regional Centre for International Commercial Arbitration.