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Significance

The UK government remains divided over how its relations with the EU’s customs union should be arranged after Brexit, while the EU is unimpressed by any of the suggestions put forward by London to date. This issue is central to both the future EU-UK trade relationship and the debate about how to resolve the question of the intra-Irish border.

Impacts

Any physical infrastructure on the Irish border would become a target for violence.

A hard border could increase support for Irish reunification among Northern Irish Catholics.

Different customs regimes in the EU and the United Kingdom could lead to smuggling.

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