Irish Taoiseach Leo Varadkar, quoted by The Irish Times, said the deal allows for an orderly withdrawal of the United Kingdom (UK), including Northern Ireland, from the EU, scheduled for 29 March 2019.  It “assures us that there’ll be no hard border between Northern Ireland and Ireland and that we’ll continue to have tariff-free and quota free trade between Britain and Ireland, which is very important for our economy.”

Northern Ireland’s Democratic Unionist Party, whose votes are critical to May’s governing coalition, has said it would try to block the Brexit deal because it binds London to many EU rules, and could weaken the province’s ties to Britain. The agreement “is worse than no deal and worse than staying in the EU,” DUP deputy leader Nigel Dodds, according to the BBC.

Business and farming groups in the North have urged the DUP to support the deal to provide certainty. Two years ago, Northern Ireland voted against Brexit, but the Leave side prevailed with strong support in England.

For now, both sides have agreed that unless they come up with a better plan in the next four months, the UK would remain locked inside the European customs union, obligated to respect most E.U. regulations on goods that pass between the two sides, including tariffs with the rest of the world.

In addition to the legally-binding Brexit language, the EU approved a non-binding political declaration on the future relationship with the UK. It contains a list of hoped-for outcomes on trade, customs inspections, tariffs, fisheries rights, aviation, and the ability of citizens to visit and live in the other’s territory, according to the Washington Post.