27It follows that, where, pursuant to the first sentence of Article 11(6) of Regulation No 1/2003, the Commission initiates proceedings against one or more undertakings for an alleged infringement of Article 101 or 102 TFEU, the competition authorities of the Member States are relieved of their competence to bring proceedings against the same undertakings for the same, allegedly anticompetitive, practices occurring on the same product and geographical market or markets during the same period or periods (judgment of 25 February 2021, Slovak Telekom, C‑857/19, EU:C:2021:139, paragraph 30).
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