The House of Lords COMMITTEE of the EU wrote a letter (27 February 18) to “Karen Bradley MP, Minister of Northern Ireland, to express his concerns about ambiguity about how the government will resolve tensions between its attempts to leave the customs union, avoid a hard border on the island of Ireland and fail to guarantee new regulatory barriers between Northern Ireland and the rest of the UK.” (Added 28 Feb 18). The agreement consists of two related documents, both agreed on Good Friday, 10 April 1998 in Belfast: the Good Friday Agreement (GFA) or the Belfast Agreement (Irish: Comhaonté Aoine an Chéasta or Comhaonté Balhérste); Ulster-Scots: Guid Friday Greeance or Bilfawst Greeance) is a couple of agreements signed on 10 April 1998 that put an end to most of the violence of the Troubles, a political conflict in Northern Ireland that had erupted since the late 1960s. This was an important development in the Northern Ireland peace process in the 1990s. Northern Ireland`s current system of de-decentralized government is based on the agreement. The agreement also created a number of institutions between Northern Ireland and the Republic of Ireland, as well as between the Republic of Ireland and the United Kingdom. The two main political parties in the agreement were the Ulster Unionist Party (UUP), led by David Trimble, and the Social Democratic and Labour Party (SDLP), led by John Hume. The two heads of state and government together won the Nobel Peace Prize in 1998. The other parties to the agreement were Sinn Féin, the Alliance Party and the Progressive Unionist Party. The Democratic Unionist Party (DUP), which later became the largest Unionist party, did not support the agreement. When Sinn Féin and loyalist parties entered, they left the talks because republican and loyalist paramilitary weapons had not been decommissioned. “If you build a large, politically controversial physical infrastructure on a border, you focus on the context and causes of the conflict,” he said. The border reaches the sea at two coves: Lough Foyle to the northwest and Carlingford Lough to the east. In the century since Ireland`s independence, she and the United Kingdom have never defined where the border is in these canals.
Both bays are recovered by boats from both nations.  During Britain`s accession to the EU, there was no need to resolve the problem, given that the Common Fisheries Policy (CFP) allowed all EU Member States to fish in the waters of other countries and neighbouring countries still had the right to fish on the coasts of the other party within 12 nautical miles.  A week after the Brexit referendum, arlene Foster, then Prime Minister of Northern Ireland, the DUP and Deputy Prime Minister Martin McGuinness, published a letter in which they said that the border should not become a catalyst for illegal activities or that it should not encourage those who want to undermine the peace process.  Irish Prime Minister Leo Varadkar informed the Irish Parliament that the United Kingdom and Ireland must respect the Good Friday agreement and respect their commitment not to have a hard border. 12 Center for Cross-Border Studies, “The Belfast/Good Friday Agreement and the negotiations on the UK`s withdrawal from the EU,” August 2018, crossborder.ie/site2015/wp-content/uploads/2018/08/Briefing-Paper-4.pdf (available in March 2019). In September 2018, the UK government guaranteed the continued free movement of EU citizens across the UK-Ireland border.  It was proposed to use the Norwegian model.  Along the Norway-Sweden border, major road crossings have customs controls where all trucks are checked, but only occasionally, and at smaller crossing points, there is only video surveillance, where trucks can pass with authorization and pre-clearance.  During negotiations on the UK`s planned withdrawal from the European Union in 2019, the EU presented a position paper on its concerns about Britain`s support for the Good Friday agreement during Brexit.