Brussels and the European Union a provisional seat, though with the Common Assembly in Strasbourg as that was the only city with a large enough hemicycle (the one used by the Council of Europe). This agreement was temporary, and plans were set to relocate the institutions to Saarbrücken which would serve as a "European District", but this did not occur. The 1957 Treaties of Rome established two new communities, the European Economic Community (EEC) and the European Atomic Energy Community (Euratom). These shared the Assembly and Court of the ECSC but created two new sets of Councils and Commissions (equivalent to the ECSC's High Authority).
Yugoslavia and the European Economic Community refused the proposal. In June 1991 an EEC mission formed by the foreign ministers of Luxembourg, Italy and the Netherlands visited Belgrade, where they talked with Yugoslav Prime Minister Ante Marković, as well as Zagreb, where they talked with Presidents Milan Kučan of Slovenia and Franjo Tuđman of Croatia. The mission members stated that almost $1 billion in economic aid would be suspended if Yugoslav military offensive continued as well as that the EEC favors the preservation of Yugoslavia as a single entity. Members of the EEC were divided over the importance they should give to the potentially contradictory principles