In extradition proceedings, the so-called "Petruhhin mechanism", although applicable during the pretrial phase, always requires citizenship of an EU Member State: this mechanism, actually, does not apply indiscriminately, but only to the benefit of persons for whom the provisions of the Treaty on European Union (TEU) regarding Union citizenship and Article 18 of the Treaty on the Functioning of the European Union (TFEU) give rise to the applicability of the Treaties