1. Participation in the mechanism for demand aggregation and the joint purchasing of natural gas shall be open to natural gas undertakings and undertakings consuming natural gas established in the Union on a non-discriminatory basis. Such undertakings shall be precluded from participating as suppliers, producers and purchasers, if they are:
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(a)
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subject to Union restrictive measures adopted pursuant to Article 29 TEU or Article 215 TFEU, consisting of a prohibition to make available or transfer funds or economic resources or to provide financing or financial assistance to them directly or indirectly, or of an asset freeze; or
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(b)
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directly or indirectly owned or controlled by, or acting on behalf or at the direction of natural or legal persons, entities or bodies subject to such Union restrictive measures.
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