معاهدة الحد من انتشار الأسلحة النووية
As Staatssekretär (deputy foreign minister) under Foreign Minister Joschka Fischer between 1998 and 2001, Ischinger represented Germany at numerous international and European conferences, including the 1999 G8 and EU summit meetings in Cologne/Germany and the 2000 Review Conference of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) at the United Nations in New York.