Ireland is where Brussels now begins.
“The Irish border issue has become an almost intractable problem. The EU’s proposed “backstop” arrangement, contained in the Brexit deal rejected three times by the British Parliament, is aimed at preventing the need for infrastructure and visible checks on the frontier by keeping the U.K. in a customs union with the bloc until a replacement solution is found.
But Ireland, which insists there can be no return to a hard border — a symbol of decades of violence which ended with a peace accord in 1998 — has been reluctant to spell out what would happen if the Brexit deal fails. The EU will oblige Ireland to check the flow of goods across the frontier because of Ireland’s place in the bloc’s customs union and single market, but officials are working on ways to ensure this can happen as much as possible away from the border, people familiar with the matter said.”