Boris Johnson (l), Prime Minister of Great Britain, and Jean-Claude Juncker, President of the European Commission, address the opening sessions of the Summit of EU Heads of State and Government. Just before the EU summit, Great Britain and the European Union achieved a breakthrough in the Brexit dispute. However, the freshly negotiated new Brexit agreement is once again facing failure because of resistance from the Northern Irish DUP party, which did not want to support the deal in a vote in the British parliament, it was said on Thursday.