He has been a delegate to many international diplomatic conferences, such as the United Nations Conference on Environment and Development (Rio de Janeiro, 1992); the United Nations Diplomatic Conference of Plenipotentiaries on the Establishment of an International Criminal Court (Rome, 1998); the 2001 Cape Town Diplomatic Conference for the adoption of the UNIDROIT Convention on International Interests in High-Value Mobile Equipment and Protocol on Aircraft Assets (Cape Town, 2001).