29In view of the fact that the principle of mutual recognition, which underpins the Framework Decision, means that, in accordance with Article 6 of that decision, the Member States are, as a rule, obliged to recognise a decision requiring payment of a financial penalty which has been transmitted in accordance with Article 4 of the Framework Decision without any further formality being required, and to take without delay all the measures necessary for its enforcement, the grounds for refusal to recognise or enforce such a decision must be interpreted restrictively (see, by analogy, Case C‑396/11 Radu [2013] ECR, paragraph 36 and the case-law cited).
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