In accordance with the principle of proportionality as set out in Article 5 of the Treaty on European Union, the recourse to a Regulation listing the third countries whose nationals must be in possession of visas when crossing the external borders and those whose nationals are exempt from that requirement is both a necessary and an appropriate means of ensuring that the common policy on visas operates efficiently.
I gcomhréir le prionsabal na comhréireachta mar a leagtar amach in Airteagal 5 den Chonradh ar an Aontas Eorpach, is bealach riachtanach agus iomchuí araon é chun a áirithiú go n-oibreoidh an comhbheartas maidir le víosaí go héifeachtúil dul ar iontaoibh Rialacháin lena liostaítear na tríú tíortha a bhfuil ar a náisiúnaigh víosaí a bheith ina seilbh acu nuair atá na teorainneacha seachtracha á dtrasnú acu agus lena liostaítear na tríú tíortha a bhfuil a náisiúnaigh díolmhaithe ón gceanglas sin.