[speech at the conference on the challenges for IHL posed by new threats, new actors and new means and methods of war, organized by the Swiss Federal Department of Foreign Affairs in cooperation with the ICRC]...[T]he existing principles of humanitarian law must be preserved...The nature of armed conflict and the causes and consequences of such conflict will continue to evolve, and it is essential that IHL continues to evolve too...The spectrum of [new] actors is still very broad:...[c]ertain organised armed groups, private military and security companies, transnational corporations...require scrutiny in this regard....Through such [updated] guidance, clarification and proposals for development, the ICRC hopes ultimately to make a meaningful contribution towards improving compliance with IHL...