Irish backstop
The Irish backstop ( formally the Northern Ireland Protocol ) is a defunct appendix to a draft Brexit withdrawal agreement developed by the May government and the European Commission in December 2017 and finalised in November 2018 , that aimed to prevent an evident border ( one with customs controls ) between the Republic of Ireland and Northern Ireland after Brexit . 
<triplet> Irish backstop <subj> Brexit <obj> part of <triplet> Republic of Ireland <subj> Northern Ireland <obj> different from <triplet> Northern Ireland <subj> Republic of Ireland <obj> different from