that additional measures to be adopted because as we know the abolition of internal border controls requires a high of mutual trust member states and also the existence of effective
This means that additional measures need to be adopted because, as we know, the abolition of internal border controls requires a high level of mutual trust between Member States and also the existence of effective controls on external borders, since the security of the Schengen area depends on the rigour and efficiency with which each Member State carries out its external border checks.
This that additional measures to be adopted because, as we know, the abolition of internal border controls requires a high of mutual trust Member States and also the existence of effective controls on borders, since the security the Schengen area depends on the and efficiency with each Member State out its external checks.