Theresa May statement after EU Brexit talks

The transcript discusses the UK's stance on leaving the EU, emphasizing that no deal is better than a bad deal. It highlights the proposed economic relationship to ensure frictionless trade and protect jobs while avoiding a hard border between Ireland and Northern Ireland. The EU's rejection of these proposals has led to an impasse. The UK opposes the EU's backstop plan, which would keep Northern Ireland in the customs union, as it threatens national integrity. The UK remains committed to its December agreements, ensuring no new regulatory barriers without Northern Ireland's consent.

What is the unacceptable proposal from the EU regarding Northern Ireland?

How does the text describe the relationship between the integrity of the UK and the EU?