175Consequently, in the event of failure to carry out an assessment of the environmental impact of a project required under the EIA Directive, although Member States are required to nullify the unlawful consequences of that failure, EU law does not preclude regularisation through the conducting of such an assessment while the project is under way or even after it has been completed, on the twofold condition, first, that national rules allowing for that regularisation do not provide the parties concerned with an opportunity to circumvent the rules of EU law or to refrain from applying them, and second, that an assessment carried out for regularisation purposes is not conducted solely in respect of the project’s future environmental impact, but must also take into account its environmental impact since the time of completion of that project (see, to that effect, judgments of 26 July 2017, Comune di Corridonia and Others, C‑196/16 and C‑197/16, EU:C:2017:589, paragraph 43, and of 28 February 2018, Comune di Castelbellino, C‑117/17, EU:C:2018:129, paragraph 30).
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