The President of the European Commission, Jean Claude Juncker said during a television interview that “the EU will not be responsible for a returning violence in Ireland." 

When asked whether a no deal Brexit would lead to the return of a hard border between the North and the South of Ireland, he replied briefly: "Yes, there will be a hard border in Ireland." 

The European leader also criticized British politicians who have forgotten the past and the Good Friday Agreement, which brought peace to the island, and predicted that "history will quickly repeat itself."

In the Brexit referendum the majority of the population of Northern Ireland voted against it, as in Scotland, unlike Wales and England where the 'Yes' triumphed.

The re-establishment of a border between the North and the South of Ireland would have enormous economic and social repercussions, especially for the population of the North of Ireland without distinction of communities, since it would prevent the free movement of people and merchandise that currently exists.

For its part the republican party Sinn Fein already announced a few months ago its intention to promote a referendum in the North of Ireland with the aim of approving the reunification of the island, a feasible option if one also considers that demographically the republican population already exceeds slightly the unionist population.