Zwei-plus-Vier-Vertrag
Before German reunification in 1990, both West and East Germany ratified the Treaty on the Final Settlement with Respect to Germany. Germany reaffirmed its renunciation of the manufacture, possession, and control of nuclear, biological, and chemical weapons. In addition to banning a foreign military presence in the former East Germany, the treaty also banned nuclear weapons or nuclear weapon carriers to be stationed in the area, making it a permanent Nuclear-Weapon-Free Zone. The German military was allowed to possess conventional weapons systems with nonconventional capabilities, provided that they were outfitted for a purely conventional role.