The European Union will be represented in the next negotiations on Ukraine by the Commission and the Council, said the representative of the European Union, Ariana Podesta and another representative of the European Union -. Politico. Diplomats were surprised when only European Commission President Ursula von der Leyen's chief of staff, Bjorn Seibert, was present in Miami and Oslo, leaving aside Pedro Loretti, the top aide to European Council President Antonio Costa.