Even if the Declaration is not a binding document, in the author’s opinion, it cannot be ignored. It expressly outlines a scenario for federalization of the European Union. The future directions of European integration cannot be shaped by a few presidents of the parliaments of EU Member States. Doubts are also raised the need for a more extensive integration. The Declaration should not be in favour of creating a new political structure of the European Union, but rather promote a departure from localism and particularism that act today as a real obstacle to the success of the Union. The document can be interpreted as an incentive to create a more integrated structure based on the states of “old Europe” while leaving another, more “loose”, form for all other States, which would be unfavourable from the point of view of Polish interests. The author recommends three variants to be applied by the Sejm in response to the Declaration: the rejection, renegotiation (which is very unlikely), or make efforts to sign a new and different declaration.