Key achievements during Berger's NSC tenure included the 1995 peso recovery package in Mexico, NATO enlargement, Operation Desert Fox, the Dayton Accords that ended the killing in Bosnia, the NATO bombing campaign against Yugoslavia that stopped the ethnic cleansing in Kosovo, the Good Friday Agreement that helped bring about peace in Northern Ireland, and the administration's policy of engagement with the People's Republic of China. In a March 2005 oral history interview at the University of Virginia's Miller Center, Berger noted, "I think during the '90s we took China from outside the international system and brought it inside the international system, partly through trade, and economics, and otherwise."