As the Maastricht Treaty was gone into effect, the European Union (EU) has founded based on the European Community on November 1, 1993. At that time, the EU has begun to consider eastward expansion.

• 1993年11月1日《马斯特里赫特条约》生效、欧共体改为欧洲联盟,欧盟形成以后就开始考虑东扩。