An EU law expert on what the attorney general's legal advice on Brexit means and its wider significance for the future.
The two countries have successfully collaborated on electricity supply for 11 years, but could Brexit pull this unique UK-Ireland innovation apart?
As England agonises over Brexit, divisions have emerged in other parts of the UK, especially in Northern Ireland and independent-minded Scotland.
Academic experts explain the key details of the draft Brexit deal agreed by UK and EU negotiators.
The deep divide between Catholics and Protestants makes the coming together to honour the dead on both sides fraught with problems.
Two decades after a peace agreement was signed in Northern Ireland, communities affected by the conflict are still living in fear of paramilitaries.
The events of the war caused Irish nationalists to push harder for their independence.
There's really only one option here, and the UK needs to do some very savvy PR to sell it to Brexiteers.
For a lot of ordinary people in Northern Ireland, the hyper-British version of unionism is missing an important part of their identity.
Negotiations are at a crucial stage, yet this central question remains unanswered.
If the UK does secure a deal with the EU, it's not clear that parliament would back it. Here are some scenarios for what could happen next.
The question of the Irish border remains at the centre of Brexit negotiations after an informal summit of EU leaders in Salzburg.
Children growing up in Northern Ireland are far less likely to be in foster or residential care than those in England, Scotland or Wales.
Belgium held the previous record with 541 days without a government. What's holding up power-sharing?
The only way forward is a more inclusive unionism that reflects the diverse and multicultural nature of the UK.
The white paper, which outlines Britain's vision for Brexit, does make independent trade deals tricky.
Is the UK's Brexit plan enough to avoid a hard Irish border?
It sparked a series of government resignations, but what's actually in Theresa May's Brexit plan?
When Northern Irish people were asked to choose between two scenarios for the post-Brexit border, they opted for one in the Irish Sea – with conditions.
Most Leave voters would rather lose Northern Ireland than drop Brexit, reflecting a longstanding indifference.