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Brexit: What is the Vienna Convention?

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The backstop plan for the Irish border remains the key sticking point for Theresa May's Brexit withdrawal agreement. The backstop is designed to ensure that there can never be a hard border between Northern Ireland and the Republic of Ireland, after Brexit. While the EU and the UK government have both stressed that this legal guarantee is intended to be temporary, some MPs are concerned that it could keep the UK permanently tied to the EU after leaving the union.Andrea Leadsom, the leader of the House of Commons, was asked on Thursday if there could be a debate to consider whether there might be a solution to this involving Article 62 of the Vienna Convention.So, what is it
The Vienna Convention is the treaty that lays down the rules about treaties - legal agreements between countries.
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'Exceptional cases'
The International Court of Justice, which rules on such matters, has been clear that it sets the bar very high.It ruled in 1997 against the use of Article 62 to get out of a treaty between Hungary and Slovakia to build a dam on the River Danube. In that judgement, it said that the claim of fundamental changes could only be applied in "exceptional cases".Hungary had claimed that since the treaty was signed in 1977, there had been profound political changes in the region (such as Czechoslovakia splitting) and a change to the economic systems in force, but the court ruled those were not sufficiently exceptional.Mr Cox clarified that the sorts of changes he was referring to would be, "either because of some fundamental political change in Northern Ireland, or some fundamental change of circumstance going to the essential basis of the agreement".Richard Gordon QC, a constitutional expert at Brick Court Chambers, told BBC News: "The point of the backstop is that if a solution is not found to the Irish border it will come into force, so to argue that it was unforeseen and exceptional would be very difficult."
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