Institutional seats of the European Union are based in Luxembourg City along with the European Investment Bank. The Economic and Social Committee and the Committee of the Regions are entirely based in Brussels while the European Central Bank is based in Frankfurt and Europol is the only agency to have its seat fixed by the treaties, in The Hague. Separately, the Treaty of Nice establishes Brussels as the venue for all formal summits of the European Council after 2004. However some extraordinary sessions are sometimes held outside the city. The European Council's seat is however fixed by a declaration rather than a protocol, meaning it is
Central European Defence Cooperation Central European Defence Cooperation The Central European Defence Cooperation (CEDC) is a military collaboration consisting of the Central European states of Austria, the Czech Republic, Slovakia, Hungary, Slovenia and Croatia. Poland enjoys an observer status in this cooperative framework. The joint objective is enhancing the defence co-operation, including the pooling and sharing of defence capabilities of the member countries and organizing common training and exercises. Since the European migrant crisis of 2015-2016 the cooperation has focused on handling mass migration too. The CEDC was created in 2010. All members are also members of European Union and all except Austria are