3. When a national court rules on a matter which is already the subject matter of a decision adopted by the Commission under this Regulation, that national court shall not take any decision which runs counter to that Commission decision. National courts shall also avoid taking decisions which could conflict with a decision contemplated by the Commission in proceedings it has initiated under this Regulation. To that effect, a national court may assess whether it is necessary to stay its proceedings. This is without prejudice to Article 267 TFEU.