Summary
The Schengen free movement area is one of the EUs most symbolic and tangible achievements Yet its functioning is increasingly at risk as Member States have reintroduced and continue to uphold internal border controls since 2015 At the same time the Schengen area still does not encompass all of the EU Member States Differentiated dynamics and difficulties to apply relevant EU legislation in this area coherently are important for understanding the dynamics defining differentiated integration in the AFSJ generally speaking
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