The coherent, effective and complementary enforcement of available legal instruments applied to gatekeepers requires cooperation and coordination between the Commission and national authorities within the remit of their competences. The Commission and national authorities should cooperate and coordinate their actions necessary for the enforcement of the available legal instruments applied to gatekeepers within the meaning of this Regulation and respect the principle of sincere cooperation laid down in Article 4 of the Treaty on European Union (TEU). It should be possible for the support from national authorities to the Commission to include providing the Commission with all necessary information in their possession or assisting the Commission, at its request, with the exercise of its powers so that the Commission is better able to carry out its duties under this Regulation.