[29] The central point of the opinion concerned the legal effect of the Backstop Agreement on Northern Ireland, the Republic of Ireland and the rest of the United Kingdom with regard to the customs border between the European Union and the United Kingdom and its impact on the Good Friday Agreement that led to the end of the unrest in Northern Ireland, and in particular on the security of the United Kingdom, to be able to leave the EU in practice, in accordance with the draft proposals. Another complication is that, unlike previous trade agreements and the Withdrawal Agreement, just four months before an agreement enters into force, there is not even a joint project in sight. After Brexit, the UK will become one of the EU`s main trading partners and the possible eu-UK free trade agreement will therefore be a key deal for the EU and the UK. .