45In particular, where a plan or project not directly connected with or necessary to the management of a site is likely to undermine the site’s conservation objectives, it must be considered likely to have a significant effect on that site. The assessment of that risk must be made in the light inter alia of the characteristics and specific environmental conditions of the site concerned by such a plan or project (judgment of 15 May 2014 in Briels and Others, C‑521/12, EU:C:2014:330, paragraph 20 and the case-law cited).